太阳星云假说如何解释行星的成分分带（内类地、外巨行星）？
How does the solar nebula hypothesis explain the compositional zoning of the Solar System (terrestrial inside, giants outside)?
在原行星盘内区温度高，挥发性冰无法凝结，只剩难熔的岩石和金属形成类地行星。外区低于雪线，水冰等挥发物可以富集，于是形成以冰和气体为主的巨行星，这一温度梯度是成分分带的根本原因。
In the inner protoplanetary disk temperatures were too high for volatile ices to condense, leaving only refractory rock and metal to build terrestrial planets. Beyond the snow line, water ice and other volatiles could accumulate, enabling ice- and gas-rich giant planets; this temperature gradient is the root cause of the compositional zoning.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-04
来源 · Source
Hayashi,《Structure of the Solar Nebula, Growth and Decay of Magnetic Fields and Effects of Magnetic and Turbulent Viscosities on the Nebula》,Progress of Theoretical Physics Supplement,1981 (DOI: 10.1143/ptps.70.35)
Hayashi, 'Structure of the Solar Nebula, Growth and Decay of Magnetic Fields and Effects of Magnetic and Turbulent Viscosities on the Nebula', Progress of Theoretical Physics Supplement, 1981, DOI: 10.1143/ptps.70.35
独立核验依据 · Independent verification: 核验依据 1 Crossref DOI 10.1143/ptps.70.35
#太阳星云 #雪线 #行星形成
木卫一为什么会成为太阳系里火山活动最猛烈的天体？
Why is Io the most volcanically active body in the Solar System?
答案在轨道共振和潮汐加热。木卫一、木卫二和木卫三处于拉普拉斯共振中，公转周期成简单整数比，迫使木卫一的轨道保持偏心。轨道每圈被木星引力拉伸变形，内部因周期性弯折而摩擦生热，热量足以维持约400座活火山。它的表面不断被硫化合物重新覆盖，形成五彩斑斓的地貌。
The answer lies in orbital resonance and tidal heating. Io, Europa, and Ganymede are locked in the Laplace resonance, their orbital periods in simple integer ratios, which keeps Io's orbit eccentric. Each circuit, Jupiter's gravity flexes the moon, and the internal friction from repeated distortion generates heat enough to sustain about 400 active volcanoes. Its surface is endlessly resurfaced by sulphur compounds, producing a vivid, colourful terrain.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#木卫一 #潮汐加热 #拉普拉斯共振 #火山
太阳系的柯伊伯带与奥尔特云在形成机制上有何不同？
How do the Kuiper Belt and the Oort Cloud differ in their formation?
柯伊伯带位于海王星轨道之外约30至50个天文单位，是形成于原行星盘外缘的冰质小天体盘，轨道大致位于黄道面附近。奥尔特云则在远处呈球状分布，主要由早期被巨行星散射出去的天体组成，并受到银河系潮汐和恒星摄动的显著塑造。
The Kuiper Belt lies just beyond Neptune at about 30 to 50 astronomical units and is a disk of icy bodies formed at the edge of the protoplanetary disk, with orbits near the ecliptic. The Oort Cloud is a distant spherical reservoir made largely of objects scattered outward by the giant planets and later shaped by galactic tides and passing stars.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#柯伊伯带 #奥尔特云 #太阳系形成 #彗星
什么是太阳系的「行星迁移」假说（尼斯模型）？
What is the planetary migration hypothesis (Nice model) for the solar system?
尼斯模型认为，早期巨行星的轨道曾经不稳定并发生过显著的迁移，把大量小天体抛向太阳系内外。这一过程被认为造成了后期的重轰炸事件，并塑造了外太阳系的结构。
The Nice model proposes that the giant planets' orbits were once unstable and underwent major migrations, flinging many small bodies inward and outward. This is thought to have caused the later heavy bombardment and shaped the structure of the outer solar system.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#尼斯模型 #行星迁移 #巨行星 #重轰炸
太阳系相对于银道面的倾角约是多少，这种几何关系有什么观测意义？
About what is the Solar System's inclination to the galactic plane, and what is the observational significance of this geometry?
太阳系黄道面与银河系银道面的夹角约 60 度，但因两平面交线恰靠近人马座，银心方向其实紧邻黄道。这一几何影响了星际尘埃消光在天空中的分布，也决定了巡天观测银道面附近天体时的策略与难度。
The ecliptic plane of the Solar System is inclined about 60 degrees to the galactic plane, yet because the line of intersection of the two planes lies near Sagittarius, the direction of the Galactic center actually sits close to the ecliptic. This geometry shapes the sky distribution of interstellar dust extinction and dictates survey strategies and difficulties when observing objects near the Galactic plane.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Binney & Merrifield《星系天文学》1998 普林斯顿大学出版社
Binney & Merrifield, Galactic Astronomy (Princeton Univ. Press, 1998)
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-691-02565-0 (Princeton University Press)
#黄道面 #银道面 #几何倾角
小行星带中的“柯克伍德空隙”是如何形成的？
How do the “Kirkwood gaps” in the asteroid belt form?
柯克伍德空隙是小行星带中几乎缺失小行星的特定半径区域，出现在与木星轨道周期成简单整数比（如3:1、2:1）的位置。在这些轨道共振点，木星引力周期性扰动使小行星轨道变得不稳定，最终将其散射出去。
Kirkwood gaps are regions in the asteroid belt nearly empty of asteroids, located where orbital periods are simple integer ratios (such as 3:1, 2:1) of Jupiter's. At these resonances, Jupiter's gravity periodically perturbs asteroids onto unstable orbits, scattering them away over time.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
《太阳系动力学》（Murray & Dermott，轨道共振与混沌扩散研究）
Solar System Dynamics (Murray & Dermott, orbital resonances)
#小行星带 #轨道共振 #柯克伍德空隙 #木星
太阳系的边界在哪里？
Where is the edge of the solar system?
太阳系的边界通常认为在日球层顶——太阳风影响终止之处，再往外才是星际空间；若算上奥尔特云，边界可延伸到距太阳约1光年。
The boundary is usually the heliopause where the solar wind stops; beyond lies interstellar space. Including the Oort Cloud, the edge may reach about one light-year from the Sun.
难度 专业 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#日球层顶 #太阳系边界
太阳耀斑和日冕物质抛射有什么区别？哪个更容易引发地磁暴？
How do solar flares and coronal mass ejections differ, and which is more likely to trigger a geomagnetic storm?
太阳耀斑是太阳大气中磁重联释放能量产生的电磁辐射爆发，能量以光速以 X 射线和紫外形式到达地球，主要影响电离层。日冕物质抛射则把数十亿吨等离子体连同其冻结的磁场整个抛向太空，需要一到三天才能到达地球。正是 CME 携带的磁场与地球磁场相互作用，才产生了最强的地磁暴。因此，相比耀斑，日冕物质抛射更容易引发强地磁暴。
A solar flare is an explosive burst of electromagnetic radiation from magnetic reconnection in the solar atmosphere; its X-rays and ultraviolet arrive at light speed and mainly disturb the ionosphere. A coronal mass ejection (CME), by contrast, hurls billions of tons of plasma and its frozen-in magnetic field into space, taking one to three days to reach Earth. It is the CME's magnetic field interacting with Earth's magnetosphere that produces the strongest geomagnetic storms. A CME is therefore far more likely than a flare to trigger a major geomagnetic storm.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#太阳耀斑 #日冕物质抛射 #地磁暴
什么是柯伊伯带？
What is the Kuiper Belt?
柯伊伯带是海王星轨道以外、布满冰质小天体的环状区域，冥王星等矮行星就位于其中，是许多短周期彗星的来源。
The Kuiper Belt is a ring of icy bodies beyond Neptune's orbit where dwarf planets like Pluto reside; it is the source of many short-period comets.
难度 专业 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#柯伊伯带 #海王星外
柯伊伯带和奥尔特云到底有什么区别？
What exactly distinguishes the Kuiper belt from the Oort cloud?
柯伊伯带是海王星轨道外30到50天文单位处的环状带，主体位于黄道面附近，包含冥王星、阋神星等冰质小天体，是短周期彗星的来源。奥尔特云则是包裹整个太阳系、范围从数千到约十万天文单位的球形云，内含上万亿颗冰体，靠附近恒星经过的引力扰动把长周期彗星抛向内太阳系。奥尔特云至今没有被直接观测到，只能从彗星轨道推断它的存在。
The Kuiper belt is a ring of icy bodies 30 to 50 astronomical units beyond Neptune, lying mostly near the ecliptic and home to Pluto, Eris, and others; it is the source of short-period comets. The Oort cloud is instead a spherical shell enveloping the whole Solar System, from a few thousand out to roughly 100,000 AU, holding trillions of icy objects that passing stars nudge inward as long-period comets. It has never been observed directly and is inferred solely from comet orbits.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据结论有争议 · Contested
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#柯伊伯带 #奥尔特云 #短周期彗星 #长周期彗星
柯伊伯带和奥尔特云有什么不同？
How do the Kuiper Belt and the Oort Cloud differ?
柯伊伯带是海王星轨道外侧一个盘状区域，距离太阳约30到55天文单位，包含冥王星等许多冰质小天体。奥尔特云则是一个包围整个太阳系的巨大球壳，最远可达数万天文单位，被认为是长周期彗星的来源。两者形状、距离和组成都差异显著。
The Kuiper Belt is a disk-shaped region just beyond Neptune, roughly 30 to 55 astronomical units from the Sun, containing many icy bodies including Pluto. The Oort Cloud is a vast spherical shell surrounding the entire Solar System, reaching tens of thousands of astronomical units, and is thought to be the source of long-period comets. They differ greatly in shape, distance, and composition.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#柯伊伯带 #奥尔特云 #彗星源
太阳系的角动量分布为何被视为一个难题？
Why is the angular momentum distribution of the solar system considered a puzzle?
太阳占据了太阳系约99.8%的质量，却只拥有总角动量的约1%，绝大多数角动量集中在行星的轨道上。这一现象通常用吸积盘中磁场与物质的耦合（磁制动）来解释，是恒星形成研究中的经典问题。
The Sun holds about 99.8 percent of the solar system's mass but only roughly 1 percent of its angular momentum, with most of it locked in the planets' orbits. This is usually explained by magnetic braking, where the young star's magnetic field couples to the protoplanetary disk, and remains a classic problem in star formation.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#角动量 #吸积盘 #恒星形成 #太阳系
DART 任务是如何测试行星防御技术的？结果如何？
How did the DART mission test planetary defense technology, and what was the result?
2022 年 9 月，DART 探测器以约 6.1 公里每秒的速度主动撞击了近地小行星迪莫波斯，这是人类首次改变小天体轨道的实验。观测确认撞击使迪莫波斯绕迪迪莫斯的轨道周期缩短了约 33 分钟，远超过预期，验证了“动能撞击”这一行星防御手段的可行性。
In September 2022, the DART spacecraft deliberately slammed into the near-Earth asteroid Dimorphos at about 6.1 km/s, the first human attempt to alter an asteroid's orbit. Measurements confirmed the impact shortened Dimorphos' orbit around Didymos by about 33 minutes, far more than expected, validating kinetic impact as a planetary defense technique.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#DART #行星防御 #小行星
1908 年通古斯事件是什么？它留下了什么教训？
What was the 1908 Tunguska event, and what lesson does it teach?
1908 年 6 月，一颗直径约几十米的小天体在西伯利亚通古斯河上空约 8 公里处空中爆炸，释放能量相当于约千万吨 TNT，摧毁了 2000 多平方公里的森林，但几乎没有留下陨石坑。它说明即使不大的小行星也可能造成区域级破坏，是现代行星防御研究的重要案例。
In June 1908, a small body tens of meters across exploded about 8 km above the Tunguska River in Siberia, releasing energy equivalent to roughly ten megatons of TNT and flattening more than 2,000 square kilometers of forest, with almost no crater left behind. It shows that even modest asteroids can cause regional devastation, and it is a key case for modern planetary defense research.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#通古斯事件 #小行星 #空中爆炸
科学家凭什么认为木卫二的冰壳下藏着海洋？
On what evidence do scientists think an ocean hides beneath Europa's icy shell?
伽利略探测器在飞掠木卫二时，测到它产生了一个感应磁场，只有表面下存在导电的咸水层才能解释这种信号。它的冰面上布满纵横交错的裂缝，撞击坑很少，说明表面年轻、有东西在不断重塑。那里的海洋水量可能是地球海洋的两倍，靠木星潮汐加热保持液态。
The Galileo spacecraft measured an induced magnetic field around Europa that can only be explained by a conductive salty layer under the surface. Its ice is criss-crossed with fractures and shows few craters, signs of a young, actively resurfaced shell. The ocean below may hold twice as much water as all of Earth's seas, kept liquid by tidal heating from Jupiter.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#木卫二 #地下海洋 #感应磁场 #潮汐加热
在太阳系里找生命，为什么优先看木卫二和土卫二这样的冰卫星？
In the search for life in the Solar System, why do icy moons like Europa and Enceladus come first?
因为它们同时具备生命所需的液态水、能量和化学原料。冰壳下的海洋被潮汐加热保持在液态，避免了恶劣的太空辐射直接轰击水面；土卫二喷出的羽流还能让探测器在轨道上就取样分析。加上火星古代湖泊的遗迹，这些海洋卫星目前是寻找地外生命最现实的候选。
Because they combine the liquid water, energy, and chemistry life needs. Tidal heating keeps their subsurface oceans liquid, and the thick ice shields the water from harsh space radiation; Enceladus even vents plumes that a spacecraft can sample from orbit. Together with the relics of ancient Martian lakes, these ocean moons are currently the most practical candidates in the search for life beyond Earth.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#海洋卫星 #地外生命 #木卫二 #土卫二
恐龙是怎么灭绝的？科学界如何确认是陨石撞击造成的？
How did the dinosaurs go extinct, and how did science confirm an asteroid impact?
约 6600 万年前，一颗直径约 10 公里的天体撞击今天墨西哥的尤卡坦半岛，形成直径约 180 公里的希克苏鲁伯陨石坑。撞击抛出的尘埃遮天蔽日，引发撞击冬季，导致包括恐龙在内约四分之三的物种灭绝；1980 年科学家在白垩纪-古近纪界线地层中发现全球性的铱异常，正是小行星撞击留下的标志。
About 66 million years ago, a body roughly 10 km across struck what is now the Yucatan Peninsula in Mexico, forming the about 180 km Chicxulub crater. The impact lofted dust that blocked sunlight, triggering an impact winter that killed about three-quarters of species, including the non-avian dinosaurs; the discovery of a worldwide iridium anomaly in the Cretaceous-Paleogene boundary layer in 1980 provided the key evidence for an asteroid.
难度 进阶 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：此条未指向带版次的可引用著作（通识性内容、机构文件或未展开的英文书名），本库不提供独立书目出处；如需精确引用，需由编辑补全具体篇目与版次。
Science（阿尔瓦雷斯等，1980）
Science (Alvarez et al., 1980)
#恐龙灭绝 #希克苏鲁伯 #铱异常
为什么科学家要密切监测近地小行星？什么样的天体被认为是“潜在威胁天体”？
Why do scientists closely monitor near-Earth asteroids, and what counts as a potentially hazardous object?
近地小行星的轨道与地球轨道接近，历史上曾有直径数十米的小天体进入大气爆炸，造成地面破坏。国际标准将轨道距离地球小于约 750 万公里且直径大于约 140 米的小行星定为“潜在威胁天体”，需要持续跟踪并精确计算其轨道。
Near-Earth asteroids travel on orbits close to Earth's, and small bodies tens of meters across have exploded in the atmosphere with ground damage in the past. Asteroids that come within about 7.5 million km of Earth and are larger than about 140 m are classified as Potentially Hazardous Objects and are tracked continuously to refine their orbits.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#近地天体 #小行星 #撞击风险
陨石可以分为哪几类？哪种陨石最古老？
How are meteorites classified, and which type is the oldest?
陨石按成分主要分为石陨石、铁陨石和石铁陨石三类，其中石陨石又可分为球粒陨石和非球粒陨石。球粒陨石含有太阳系早期形成的毫米级球粒，几乎没有经历过母体加热改造，保留着 45.6 亿年前太阳系起源的物质，因此被认为是最原始的陨石。
Meteorites fall into three main classes by composition, stony, iron and stony-iron, with stony meteorites further split into chondrites and achondrites. Chondrites contain millimeter-sized chondrules from the early solar system and have undergone almost no parent-body heating, preserving material from 4.56 billion years ago, so they are regarded as the most primitive meteorites.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#陨石 #球粒陨石 #太阳系起源
流星雨是怎么形成的？为什么同一流星雨每年会在固定时间出现？
How do meteor showers form, and why do the same showers recur at fixed dates each year?
流星雨的来源是彗星：彗星在轨道上剥离出大量尘埃碎片，形成沿轨道分布的碎片流，地球每年在同一时间穿过该碎片流，碎片进入大气高速燃烧形成流星雨。因为地球在固定的轨道位置穿过碎片流，所以流星雨每年都在大致相同的日期出现。
Meteor showers come from comets, which shed streams of dust grains along their orbits. Each year Earth passes through the same debris stream at the same orbital location; grains burn up in the atmosphere at high speed, producing the shower. Because Earth crosses the stream at a fixed orbital position, a given shower returns at about the same calendar date every year.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#流星雨 #彗星 #碎片流
月球成因的大碰撞假说主要有哪些地质与同位素证据支撑？
What geologic and isotopic evidence mainly supports the giant-impact hypothesis for the Moon's origin?
大碰撞假说认为约 45 亿年前一颗火星大小的天体（Theia）撞击早期地球，溅出的物质盘聚成了月球。关键证据包括地月氧、钛、钨同位素几乎一致（说明同源）、月球挥发性元素匮乏且铁核极小，以及月球岩石年龄与地球最古老矿物相符。
The giant-impact hypothesis holds that about 4.5 billion years ago a Mars-sized body (Theia) struck the early Earth and the debris disk coalesced into the Moon. Key evidence includes the near-identical oxygen, titanium and tungsten isotopes of Earth and Moon (showing common origin), the Moon's depletion in volatile elements and tiny iron core, and lunar rock ages matching Earth's oldest minerals.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-04
来源 · Source
Canup, Asphaug,《Origin of the Moon in a giant impact near the end of the Earth's formation》,Nature,2001 (DOI: 10.1038/35089010)
Canup, Asphaug, 'Origin of the Moon in a giant impact near the end of the Earth's formation', Nature, 2001, DOI: 10.1038/35089010
独立核验依据 · Independent verification: 核验依据 1 Crossref DOI 10.1038/35089010
#大碰撞假说 #月球起源 #同位素
土卫二的冰喷泉是从哪里来的？
Where do Enceladus's ice geysers come from?
卡西尼探测器发现土卫二南极的几条大裂缝会持续喷出水汽和冰粒，形成高达数百公里的喷流。这些喷泉的源头是冰壳下几十公里深处的液态海洋，海洋里的水通过裂缝上涌，在真空环境中沸腾喷发。卡西尼还直接飞过喷流，在里面检测到了有机分子。
The Cassini spacecraft found long fissures at Enceladus's south pole continuously venting water vapour and ice grains into tall plumes hundreds of kilometres high. Their source is a liquid ocean tens of kilometres beneath the icy crust; water rises through the fractures and boils out into the vacuum. Cassini even flew through the plumes and detected organic molecules inside.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#土卫二 #喷泉 #地下海洋 #卡西尼
海王星是如何在被直接观测到之前就被预测出来的？
How was Neptune predicted before it was directly observed?
19世纪天文学家发现天王星的实际轨道偏离了牛顿引力计算的预期。法国人勒维耶和英国人亚当斯分别独立推算出，必定存在一颗更外侧的未知行星在扰动天王星。1846年，天文学家根据计算位置果然找到了海王星，这是天体力学的一次伟大胜利。
In the 19th century astronomers noticed that Uranus deviated from the orbit predicted by Newtonian gravity. Working independently, Le Verrier in France and Adams in Britain calculated that an unknown outer planet must be perturbing Uranus. In 1846 astronomers found Neptune exactly where the calculations pointed, a triumph of celestial mechanics.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#海王星 #引力 #预测发现
木星到底是地球的守护神还是威胁？
Is Jupiter Earth's protector or a threat?
两方面的影响都存在。木星庞大的引力会偏转一些长周期彗星和小行星的轨道，把它们甩出内太阳系，减少地球被撞的概率；但反过来，它同样能把天体弹向地球方向，增加撞击风险。具体效果取决于天体的来源和轨道，科学家至今没有统一的定论。
It does both. Jupiter's immense gravity deflects some long-period comets and asteroids, flinging them out of the inner Solar System and lowering Earth's impact odds; conversely, it can also sling objects toward us, raising the risk. The net effect depends on an object's origin and orbit, and scientists still have no single settled answer.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据结论有争议 · Contested
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#木星 #地球 #撞击风险 #引力偏转
太阳系的奥尔特云是什么？
What is the Oort Cloud of the solar system?
奥尔特云是理论上包裹太阳系外围的球状云团，距太阳大约从几千到十万个天文单位。它被认为是长周期彗星的来源地。
The Oort Cloud is a hypothetical spherical shell of icy bodies thought to surround the solar system at distances from a few thousand to about 100,000 astronomical units. It is believed to be the source of long-period comets.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#奥尔特云 #彗星 #太阳系外围 #天文单位
冥王星为什么被从行星中除名？
Why was Pluto removed from the planet list?
2006年国际天文学联合会规定行星需“清空轨道附近天体”，而冥王星轨道附近仍有大量类似天体，因此被重新归类为矮行星。
In 2006 the IAU required planets to have 'cleared their orbital neighborhood'; Pluto shares its region with many similar bodies, so it was reclassified as a dwarf planet.
难度 进阶 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#冥王星 #矮行星
什么是潮汐锁定，为什么月球总以同一面朝向地球？
What is tidal locking and why does the Moon always show us the same face?
地球对月球的引力在月球上产生潮汐隆起，长期的潮汐摩擦使其自转周期与公转周期同步，于是月球始终以同一面朝向我们。
Earth's gravity raises tidal bulges on the Moon, and long-term tidal friction synchronized its spin with its orbit, so the Moon always keeps the same face toward us.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#潮汐锁定 #月球
木卫一（Io）为何是太阳系中火山活动最剧烈的天体？
Why is Jupiter's moon Io the most volcanically active body in the solar system?
木卫一受到木星强大的引力牵引，并与木卫二、木卫三形成轨道共振（拉普拉斯共振），持续的潮汐挤压使其内部反复摩擦生热。这种潮汐加热融化了内部岩石，造就了遍布全球的活火山。
Io is squeezed by Jupiter's strong gravity and locked in an orbital resonance with Europa and Ganymede (the Laplace resonance). The constant tidal flexing heats its interior through friction, melting rock and driving widespread active volcanism.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#木卫一 #潮汐加热 #火山 #轨道共振
关于月球的起源，目前学界最主流的假说是什么？
What is the leading scientific hypothesis for the origin of the Moon?
主流的“大碰撞假说”认为，约45亿年前一颗火星大小的原行星（常称“忒伊亚”）撞击了早期地球，溅出的物质在地球周围吸积形成了月球。阿波罗任务带回的月球岩石与该假说相符，例如月岩与地幔具有几乎一致的氧同位素组成。
The leading “giant-impact hypothesis” holds that about 4.5 billion years ago a Mars-sized protoplanet (often called Theia) struck the early Earth, and debris from the impact accreted into the Moon. Apollo lunar samples support this, notably showing Moon rocks and Earth's mantle share nearly identical oxygen isotopes.
难度 进阶 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#月球起源 #大碰撞 #阿波罗 #忒伊亚
金星为什么那么热？
Why is Venus so hot?
金星表面温度高达约465摄氏度，是太阳系中最热的行星。它的大气层几乎全是二氧化碳，并覆盖着厚厚的硫酸云，形成了极强的温室效应，使得热量无法散逸。尽管金星离太阳不如水星近，其温室效应却把表面加热到足以熔化铅的程度。
Venus has a surface temperature of about 465 degrees Celsius, making it the hottest planet in the Solar System. Its atmosphere is almost entirely carbon dioxide with thick clouds of sulfuric acid, producing a runaway greenhouse effect that traps heat. Although Venus is farther from the Sun than Mercury, this greenhouse effect heats its surface enough to melt lead.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#金星 #温室效应 #太阳系
地磁暴会对卫星和电网造成什么影响？
How do geomagnetic storms affect satellites and power grids?
磁暴期间高能粒子会穿透卫星，造成单粒子翻转等故障，浓密大气加热上升还会增加卫星轨道阻力，使卫星轨道加速衰减。同时地磁感应电流会流入长距离输电线路，可能使变压器过热损坏，历史上曾造成大规模停电。
During magnetic storms, energetic particles can strike satellites, causing faults such as single-event upsets, while the heated, denser upper atmosphere increases drag and speeds orbital decay. Meanwhile, geomagnetically induced currents flow through long transmission lines and can overheat transformers, historically causing large-scale blackouts.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#地磁暴 #卫星 #电网
土卫六为什么能拥有浓密的大气？
Why does Titan get to have a thick atmosphere?
土卫六是太阳系里唯一拥有浓密大气层的卫星，地表气压约为地球的1.5倍，主要成分是氮气。它离太阳很远、温度极低，甲烷在表面以液态存在，形成了类似地球水循环的甲烷循环，有雨、有河、有湖。惠更斯探测器2005年降落其表面时，就拍到了被甲烷河流切割过的地貌。
Titan is the only moon in the Solar System with a thick atmosphere, its surface pressure about 1.5 times Earth's and composed mainly of nitrogen. Far from the Sun and bitterly cold, methane exists as a liquid there, driving a methane cycle like Earth's water cycle, complete with rain, rivers, and lakes. When the Huygens probe landed on its surface in 2005, it photographed terrain carved by methane rivers.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#土卫六 #甲烷循环 #氮气大气 #惠更斯
为什么水星表面的温差特别大？
Why does Mercury have such extreme temperature swings?
水星离太阳很近，白昼正对太阳的一面温度可超过400摄氏度，而夜晚背阴面可降至零下170摄氏度左右。它几乎没有大气层来储存和传导热量，加上自转缓慢，导致一个昼夜漫长，表面热量迅速散失。这种极端温差使水星成为太阳系中表面气候最严酷的行星之一。
Mercury is very close to the Sun, so its dayside can exceed 400 degrees Celsius while its nightside drops to about minus 170 degrees Celsius. It has almost no atmosphere to store and redistribute heat, and its slow rotation makes each day and night very long, allowing surface heat to escape quickly. These factors make Mercury one of the most thermally extreme worlds in the Solar System.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#水星 #温差 #太阳系
极光是怎么产生的？为什么大多出现在极地附近？
How do auroras form, and why are they mostly seen near the poles?
太阳风中的带电粒子沿地球磁力线被引导到两极附近的高空，与氧、氮原子碰撞并使其激发，原子回到基态时放出特定波长的光，形成极光。因为磁力线在两极汇聚，所以带电粒子主要进入极区大气，极光也因此集中出现在高纬度地区。
Charged particles from the solar wind are guided by Earth's magnetic field lines into the upper atmosphere near the poles, where they collide with and excite oxygen and nitrogen atoms; as the atoms return to their ground state they emit light of specific wavelengths, creating auroras. Because field lines converge at the poles, particles enter mainly in polar regions, so auroras concentrate at high latitudes.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#极光 #太阳风 #磁层
日食和月食有什么区别？
What is the difference between a solar and a lunar eclipse?
日食发生在月球运行到太阳和地球之间，遮挡住太阳光，只在地球上狭窄的带状区域可见。月食则是地球运行到太阳和月球之间，地球影子投到月球上，使整面月球变暗，半个地球都能看到。日食必在新月，月食必在满月。
A solar eclipse happens when the Moon passes between the Sun and Earth and blocks the Sun's light, visible only along a narrow path on Earth. A lunar eclipse occurs when Earth lies between the Sun and Moon and casts its shadow onto the Moon, dimming it so that half the Earth can see it. Solar eclipses occur at new Moon, and lunar eclipses at full Moon.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#日食 #月食 #食
太阳风与地球磁场是如何相互作用的？
How do the solar wind and Earth's magnetic field interact?
太阳持续发出带电粒子流——太阳风，速度可达每秒数百公里。地球磁场在空间中形成磁层，像屏障一样把大部分太阳风偏转开，太阳风在磁层外侧形成弓形激波，磁场还把一部分带电粒子捕获进范艾伦辐射带。
The Sun continuously releases a stream of charged particles, the solar wind, moving at hundreds of kilometers per second. Earth's magnetic field creates a magnetosphere that deflects most of the wind like a barrier; the wind forms a bow shock upstream, and the field traps some charged particles in the Van Allen belts.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#太阳风 #磁层 #范艾伦辐射带
柯伊伯带和奥尔特云在太阳系结构里分别扮演什么角色？
What roles do the Kuiper Belt and the Oort Cloud play in Solar System structure?
柯伊伯带是海王星轨道外、贴近黄道面的冰质小天体盘，是短周期彗星的来源。奥尔特云是包裹太阳系的、半径约 1–2 光年的球壳状彗星库，提供长周期彗星，两者共同构成太阳系外缘的冰封边疆。
The Kuiper Belt is a disk of icy bodies just beyond Neptune, near the ecliptic plane, and it supplies short-period comets. The Oort Cloud is a roughly spherical shell of comets about 1–2 light-years in radius enclosing the Solar System and feeding long-period comets, together forming the frozen outer frontier.
难度 进阶 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#柯伊伯带 #奥尔特云 #彗星源
为什么火星曾经可能有液态水，现在却干涸了？
Why might Mars have had liquid water but is now dry?
早期火星有较厚大气和磁场保护，表面温暖足以存在液态水；随着内核冷却、磁场消失、大气被太阳风剥离，水便蒸发或冻结流失。
Early Mars had a thicker atmosphere and magnetic field shielding, keeping the surface warm enough for liquid water; as its core cooled and the magnetic field died, the solar wind stripped the atmosphere and water escaped or froze.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#火星 #液态水
1859 年卡林顿事件发生了什么？为什么今天人们仍警惕同类事件？
What happened during the 1859 Carrington Event, and why do we remain alert to a repeat?
1859 年 9 月，一次超强太阳爆发引发史上最强地磁暴，地磁感应电流让低纬度的电报机起火，连加勒比海地区都能看到极光。当时世界主要依赖电报；今天电网、卫星导航和通信系统对地磁暴更加脆弱，科学家估计同样规模的超级磁暴可能造成巨大的经济损失，因此把它作为最坏情况来研究。
In September 1859 an extreme solar storm produced the strongest geomagnetic storm on record: induced currents set low-latitude telegraph systems on fire, and auroras were even seen in the Caribbean. The 1859 world depended mainly on telegraphs, while today's power grids, satellite navigation and communications are far more vulnerable, so scientists study a similar superstorm as a worst-case scenario given its potentially enormous economic cost.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#卡林顿事件 #地磁暴 #空间天气
土星的光环是由什么组成的？
What are Saturn's rings made of?
土星的光环主要由无数冰块和岩石碎屑组成，颗粒大小从微小尘埃到几米大的石块不等。这些物质大多由水冰构成，所以能强烈反射阳光，使光环明亮可见。土星强大的潮汐力阻止了这些碎屑聚合成一颗卫星。
Saturn's rings are made of countless pieces of ice and rock debris, ranging in size from tiny dust grains to boulders several meters across. Most of the material is water ice, which reflects sunlight strongly and makes the rings bright. Saturn's powerful tidal forces prevent the debris from clumping together into a moon.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#土星 #行星环 #冰
太阳风对太阳系有何影响？
How does the solar wind affect the solar system?
太阳风是太阳持续向外喷射的带电粒子流，速度大约每秒400公里。它在约100个天文单位处形成日球层顶，阻挡了部分星际物质进入太阳系。
The solar wind is a steady stream of charged particles from the Sun, moving at about 400 kilometers per second. It forms the heliopause at roughly 100 astronomical units, shielding the solar system from some interstellar material.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#太阳风 #日球层 #太阳活动 #行星际
天王星的自转轴为何几乎“躺着”转动，它又有怎样的环系？
Why does Uranus rotate almost “on its side,” and what kind of rings does it have?
天王星的自转轴倾角约98°，几乎是横躺在轨道平面上转动，主流解释是形成早期遭受了一次巨大的侧向撞击。它拥有一组暗淡、狭窄且与其赤道共面的环；由于自转轴近乎横躺，整个环系相对于其轨道平面近乎垂直，由旅行者2号详细探测。
Uranus has an axial tilt of about 98°, essentially rolling on its side, most likely from a giant off-center impact early in its history. It also has a set of dark, narrow rings lying in its equatorial plane; because of the near-sideways spin, the whole ring system is nearly perpendicular to the orbital plane, mapped in detail by Voyager 2.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#天王星 #自转轴倾角 #行星环 #旅行者2号
为何水星拥有异常巨大且富含铁的金属核心？
Why does Mercury have an unusually large, iron-rich metallic core?
水星的核心占据其半径约85%，质量占比远高于其他类地行星。信使号（MESSENGER）探测表明，这可能是由于太阳系形成早期水星经历了一次巨大撞击、剥离了大部分外层硅酸盐幔，或是在高温原行星盘中铁优先吸积所致。
Mercury's core takes up about 85% of its radius, a far larger metal fraction than other terrestrial planets. MESSENGER data suggest this may result from a giant impact early in solar-system history that stripped much of its silicate mantle, or from preferential iron accretion in the hot protoplanetary disk.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#水星 #铁核 #信使号 #行星形成
小行星带为什么没能聚成一颗行星？
Why did the asteroid belt fail to assemble into a planet?
主要阻力来自木星。木星强大的引力不断扰动小行星带的天体，让它们的相对速度太大，撞到一起往往崩碎而不是黏合；木星的轨道共振区还把许多小天体清了出去。小行星带全部物质加起来还不到月球质量的4%，只能说是一颗没能长成的行星的原料。
Jupiter is the main culprit. Its powerful gravity keeps stirring up the belt, giving the bodies there too much relative speed so collisions smash them apart rather than gluing them together, and its orbital resonances sweep many objects out entirely. All the belt's material together is under four percent of the Moon's mass — the raw stuff of a planet that never grew up.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#小行星带 #木星引力 #轨道共振
太阳活动有周期性吗？这个周期是如何被观测到的？
Does solar activity vary periodically, and how is the cycle observed?
太阳活动以约 11 年为周期起伏，直接反映在黑子数量的变化上，从极小期到极大期再回落。太阳动力学天文台等卫星持续监测黑子、耀斑和磁场，还发现每隔约 22 年太阳整体磁场极性会完成一次翻转循环，因此称磁周期为 22 年。
Solar activity rises and falls on a roughly 11-year cycle, most directly seen in sunspot counts, which climb from minimum to maximum and back. Satellites such as the Solar Dynamics Observatory continuously monitor sunspots, flares and magnetic fields, and also reveal that the Sun's overall magnetic polarity flips every 22 years or so, the full magnetic cycle.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#太阳活动 #黑子 #11年周期
土卫六（Titan）表面为何被认为与早期地球有相似之处？
Why is Titan's surface thought to resemble early Earth?
土卫六是太阳系中唯一拥有浓厚大气层和表面液体的卫星。卡西尼-惠更斯任务发现其两极分布着由液态甲烷和乙烷构成的湖泊与河流，并存在类似地球的降雨-侵蚀-沉积循环，只是“水”被碳氢化合物取代。
Titan is the only moon with a thick atmosphere and surface liquids. The Cassini–Huygens mission found polar lakes and rivers of liquid methane and ethane, plus an Earth-like cycle of rain, erosion, and deposition—except that hydrocarbons replace water.
难度 进阶 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#土卫六 #甲烷湖 #卡西尼-惠更斯 #地外环境
为什么水星表面温差极大？
Why does Mercury have such extreme temperature swings?
水星几乎没有大气来储存和传递热量，加上自转缓慢、公转很快，向阳面可达430°C，背阳面降至-180°C。
Mercury has almost no atmosphere to store or redistribute heat, and with slow rotation and fast orbit, its day side reaches 430°C while the night side drops to -180°C.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#水星 #温差
太阳系大约形成于多少年前？
About how long ago did the solar system form?
太阳系大约形成于46亿年前，由一团巨大的分子云引力坍缩而成。太阳系中最古老的陨石为这一年龄提供了直接证据。
The solar system formed about 4.6 billion years ago from the gravitational collapse of a giant molecular cloud. The oldest meteorites in the solar system provide direct evidence for this age.
难度 进阶 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#太阳系年龄 #分子云 #陨石 #形成
小行星带是什么？
What is the asteroid belt?
小行星带位于火星和木星轨道之间，是数十万颗岩石和金属小天体的聚集区。这些天体是太阳系形成时未能聚合为行星的残余物质。虽然数量众多，但它们之间的空隙很大，探测器穿过时几乎不会碰到任何东西。
The asteroid belt lies between the orbits of Mars and Jupiter and is home to hundreds of thousands of small rocky and metallic bodies. These objects are leftovers from the Solar System's formation that never coalesced into a planet. Although numerous, they are far apart, so spacecraft pass through without hitting anything.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#小行星带 #太阳系 #残余物质
海卫一（Triton）的轨道有什么不寻常之处，它如何揭示其起源？
What is unusual about Triton's orbit, and what does it reveal about its origin?
海卫一沿与海王星自转方向相反的逆行轨道运行，且轨道几乎为正圆。这种不寻常的轨道表明它并非与海王星同时形成，而是一颗被海王星引力捕获的柯伊伯带天体，捕获过程剧烈改变了它的轨道。
Triton orbits Neptune backwards (retrograde) yet on a nearly circular path. Such an unusual orbit indicates it did not form with Neptune but is a captured Kuiper Belt object, with a violent capture reshaping its orbit.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#海卫一 #逆行轨道 #捕获 #柯伊伯带
为什么彗星的轨道又长又扁？
Why are comet orbits so long and stretched out?
绝大多数彗星诞生在遥远的柯伊伯带或奥尔特云，原本只在太阳系边缘缓缓绕行。当行星的引力或者路过的恒星的扰动把它们推向内太阳系时，它们就沿着一端贴近日点、另一端伸向远方的极扁椭圆轨道飞进来。因此有的彗星几百年回来一次，有的几百万年才回来一次。
Most comets are born in the distant Kuiper belt or Oort cloud, originally creeping slowly around the fringes of the Solar System. When the gravity of the planets or a passing star nudges them inward, they plunge in along extremely elongated ellipses, with one end grazing the Sun and the other reaching far out. That is why some comets return every few hundred years and others every few million.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#彗星轨道 #椭圆 #柯伊伯带 #奥尔特云
天王星为什么几乎是躺着自转的？
Why does Uranus rotate almost on its side?
天王星的自转轴倾斜约98度，看起来像是横躺着绕太阳公转。科学家普遍认为它在形成早期曾遭一颗巨大天体撞击，被撞翻了过来。这种极端倾斜导致天王星的两极会各自经历长达数十年的连续白昼或黑夜。
Uranus has an axial tilt of about 98 degrees, so it appears to roll on its side as it orbits the Sun. Scientists generally think a massive object struck it early in its formation and knocked it over. This extreme tilt gives Uranus poles that each experience decades of continuous daylight or darkness.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#天王星 #自转轴 #大碰撞
为什么金星表面温度比水星还高？
Why is Venus's surface hotter than Mercury's?
金星浓厚的二氧化碳大气产生极强温室效应，把热量牢牢锁住，表面均温约465°C，反而超过离太阳更近的水星。
Venus's thick carbon-dioxide atmosphere creates a runaway greenhouse effect that traps heat, giving a surface average of about 465°C—hotter than Mercury despite being farther from the Sun.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#金星 #温室效应
土星的环主要由什么构成，为什么不会聚成卫星？
What are Saturn's rings made of, and why don't they clump into a moon?
土星环几乎全由水冰碎块与岩石组成，大小从尘埃到巨石不等；它们离土星太近，处于洛希极限内，潮汐力阻止了这些物质聚集成卫星。
Saturn's rings are almost entirely water-ice chunks and rock, from dust to boulders. They lie inside the Roche limit, where tidal forces prevent the material from clumping into a moon.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#土星环 #洛希极限
木星表面的大红斑是什么？
What is the Great Red Spot on Jupiter?
大红斑是木星上一个持续了至少数百年的巨型风暴，比地球还要大。它是一个高速反气旋，云层顶端因化学物质和阳光作用呈现红褐色。木星强大的内部热源和快速自转使它上面的风暴可以维持极长时间。
The Great Red Spot is a giant storm on Jupiter that has lasted for at least several centuries and is larger than Earth. It is a high-speed anticyclone whose cloud tops appear reddish-brown due to chemicals and sunlight. Jupiter's strong internal heat and rapid rotation allow such storms to persist for very long periods.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#木星 #大红斑 #行星风暴
太阳风是什么，对地球有何影响？
What is the solar wind and how does it affect Earth?
太阳风是太阳持续抛出的带电粒子流，与地球磁场相互作用会产生极光，强爆发时还会干扰卫星和电网。
The solar wind is a steady stream of charged particles from the Sun; interacting with Earth's magnetic field it creates auroras, and strong bursts can disrupt satellites and power grids.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#太阳风 #极光
流星和陨石有什么不一样？
What is the difference between a meteor and a meteorite?
流星是太空中的小石头进入地球大气时摩擦发光形成的光迹，我们通常叫它流星或许愿星。如果这块石头没有完全烧掉，落到地面上，我们就叫它陨石。所以流星是天上一闪而过的光，陨石是掉到地上的石头。
A meteor is the streak of light made when a small space rock burns up by friction in Earth's atmosphere, often called a shooting star. If the rock survives and lands on the ground, we call it a meteorite. So a meteor is a flash of light in the sky, while a meteorite is a rock that has fallen to the ground.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Carl Sagan,《Cosmos》Random House,1980;中译《宇宙》
C. Sagan, Cosmos, Random House, 1980; Chinese ed.
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9780394502946（按标识回读: Cosmos）
#流星 #陨石 #小行星
太阳系里有哪些行星？
What planets are in the Solar System?
太阳系有八大行星，按照离太阳从近到远的顺序是：水星、金星、地球、火星、木星、土星、天王星和海王星。其中前四颗体积小、密度高，被称为类地行星；后四颗体积庞大、主要由气体或冰组成，被称为巨行星。冥王星在2006年被国际天文学联合会重新归类为矮行星。
The Solar System has eight planets, ordered by distance from the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. The first four are small and rocky and are called terrestrial planets, while the last four are large bodies made mostly of gas or ice and are called giant planets. Pluto was reclassified as a dwarf planet by the International Astronomical Union in 2006.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#行星 #太阳系 #八大行星
太阳系里一共有几颗行星？
How many planets are there in the solar system?
太阳系有八颗行星：水星、金星、地球、火星、木星、土星、天王星和海王星。
There are eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#太阳系 #八大行星
木星为什么被称为地球的守护者？
Why is Jupiter called Earth's protector?
木星质量巨大，其强大的引力会把许多原本可能飞向地球内部太阳系的彗星和小行星甩偏或捕获。这种引力清扫作用显著减少了撞击地球的危险天体数量。不过木星有时也会把天体送入内太阳系，因此它既是盾牌也是搅动者。
Jupiter is so massive that its strong gravity deflects or captures many comets and asteroids that might otherwise head toward the inner Solar System. This gravitational sweeping greatly reduces the number of dangerous impactors reaching Earth. However, Jupiter can also occasionally send objects inward, so it acts both as a shield and as a disturbant.
难度 入门 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#木星 #引力 #小行星防护
土星环主要由什么组成？它们的年龄存在怎样的争议？
What are Saturn's rings mainly made of, and what debate surrounds their age?
土星环主要由无数水冰颗粒构成，夹杂少量岩石碎屑，单个颗粒从微米到数米不等。关于其年龄长期存在争论：传统观点认为它们与土星同龄（约45亿年），而卡西尼号对环质量的测算显示它们可能相对年轻（约1亿年），但尚无定论。
Saturn's rings are made mostly of countless water-ice particles mixed with a little rocky debris, ranging from microns to meters across. Their age is debated: traditionally thought to be as old as Saturn (~4.5 billion years), but Cassini mass measurements suggest they could be much younger (~100 million years), though this remains unsettled.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据结论有争议 · Contested
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#土星环 #水冰 #卡西尼号 #行星环年龄
彗星是从哪里来的？
Where do comets come from?
彗星大多来自太阳系外缘的柯伊伯带和奥尔特云，当它们被扰动飞向太阳时，冰物质受热蒸发，形成明亮的彗发和尾巴。
Comets mostly come from the Kuiper Belt and Oort Cloud at the solar system's edge; when nudged toward the Sun, their ice vaporizes into a bright head and tail.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#彗星 #柯伊伯带
太阳系里有哪些大块头行星？
What are the big planets in the Solar System?
太阳系有八颗行星，从靠近太阳的水星、金星、地球、火星，到外面的木星、土星、天王星、海王星。木星最大，比地球大很多很多。
The Solar System has eight planets, from Mercury, Venus, Earth and Mars close to the Sun, out to Jupiter, Saturn, Uranus and Neptune. Jupiter is the biggest, far larger than Earth.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#八大行星 #木星 #太阳系
地球为什么是目前唯一已知有生命的行星？
Why is Earth the only known planet with life so far?
地球与太阳的距离恰到好处，使表面能保持液态水，这被称为宜居带。它还有富含氧气的大气层、保护我们免受辐射的磁场，以及调节气候的海洋。这些条件的组合在已知行星中非常罕见，所以至今我们只确认地球上有生命。
Earth sits at just the right distance from the Sun to keep liquid water on its surface, a region called the habitable zone. It also has an oxygen-rich atmosphere, a magnetic field that shields us from harmful radiation, and oceans that help regulate climate. This combination is rare among known planets, which is why Earth is the only world confirmed to host life so far.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#地球 #生命 #宜居带
太阳系由哪些主要天体组成？
What are the main bodies that make up the Solar System?
太阳系以太阳为中心，包含八大行星、矮行星、卫星、小行星带、柯伊伯带天体和彗星等。太阳质量占整个太阳系的99.86%。
The Solar System is centered on the Sun and includes eight planets, dwarf planets, moons, the asteroid belt, Kuiper Belt objects and comets. The Sun alone holds 99.86% of the system's mass.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#太阳系 #行星
彗星为什么会拖着尾巴？
Why do comets have tails?
彗星接近太阳时，冰质表面受热升华，喷出气体和尘埃，被太阳风与辐射压推向后方，形成背离太阳的彗尾。
As a comet nears the Sun, its icy surface sublimates and releases gas and dust, which solar wind and radiation pressure sweep backward into a tail pointing away from the Sun.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#彗星 #彗尾
什么是小行星带？
What is the asteroid belt?
小行星带位于火星与木星轨道之间，聚集了数百万颗岩石和金属碎块，是太阳系形成时未能合并成行星的残余物质。
The asteroid belt lies between Mars and Jupiter and holds millions of rocky and metallic fragments—leftover material from the Solar System's formation that never coalesced into a planet.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#小行星带 #木星
木星大红斑是什么，它正在发生怎样的变化？
What is Jupiter's Great Red Spot, and how is it changing?
大红斑是木星上一场持续了至少三百年的巨型反气旋风暴，比地球还大。朱诺号与哈勃太空望远镜的长期观测显示，它的横向尺寸正在缓慢缩小，尽管其成因（为何如此长寿）仍是研究课题。
The Great Red Spot is a giant anticyclonic storm on Jupiter that has persisted for at least three centuries and is larger than Earth. Long-term Juno and Hubble observations show its width is slowly shrinking, though why it lasts so long remains an active research topic.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#木星 #大红斑 #反气旋 #朱诺号
太阳系里最大的行星是哪一颗？
Which planet is the largest in the solar system?
木星是太阳系中最大的行星，它的体积能装下超过1300个地球。它是一颗气态巨行星，主要由氢和氦组成。
Jupiter is the largest planet in the solar system; more than 1,300 Earths could fit inside it. It is a gas giant made mostly of hydrogen and helium.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#木星 #气态巨行星 #太阳系 #行星大小
小行星带在哪里？
Where is the asteroid belt?
小行星带位于火星和木星轨道之间，聚集了成千上万块岩石和金属碎块。
The asteroid belt lies between the orbits of Mars and Jupiter, filled with countless rocky and metallic fragments.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#小行星带 #火星木星
彗星为什么会拖着长长的尾巴？
Why do comets have long tails?
彗星是结冰的脏雪球，靠近太阳时表面的冰受热升华成气体和尘埃。太阳风和辐射压力把这些物质推离彗星，形成背向太阳的彗尾，有时还分出尘埃尾和离子尾。彗星越靠近太阳，尾巴就越长越亮。
Comets are dirty snowballs of ice that, when near the Sun, release gas and dust as their surface ices sublimate. Solar wind and radiation pressure push this material away from the comet, forming tails that point away from the Sun, sometimes splitting into a dust tail and an ion tail. The closer a comet gets to the Sun, the longer and brighter its tail becomes.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#彗星 #彗尾 #太阳风
太阳系大约有多少岁了？
How old is the solar system?
太阳系约形成于46亿年前，由一团坍缩的星际气体尘埃云凝聚而成。
The solar system formed about 4.6 billion years ago from a collapsing cloud of interstellar gas and dust.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#太阳系年龄 #形成
月球是如何形成的？
How did the Moon form?
主流假说认为，约45亿年前一颗火星大小的天体撞上早期地球，溅出的物质在轨道上聚集形成了月球。
The leading theory holds that about 4.5 billion years ago a Mars-sized body struck the early Earth, and debris from the impact coalesced in orbit to form the Moon.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#月球 #撞击说
为什么冥王星被降级为矮行星？
Why was Pluto reclassified as a dwarf planet?
2006年国际天文学联合会规定，行星必须清空其轨道附近的其他天体。冥王星虽然绕太阳运行且近似球形，但未能清空柯伊伯带中众多类似天体，因此被归为矮行星。这一决定反映了对太阳系外缘小天体群体认知的深化。
In 2006 the IAU ruled that a planet must have cleared its orbital neighborhood of other bodies. Pluto orbits the Sun and is roughly round, but it has not cleared the many similar objects in the Kuiper Belt, so it was classed as a dwarf planet. The decision reflected deeper understanding of the small-body population in the outer Solar System.
难度 入门 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#冥王星 #矮行星 #IAU定义
彗星拖着的长尾巴是怎么来的？
Where does a comet's long tail come from?
彗星是带着冰和尘埃的脏雪球，靠近太阳时冰被晒化，喷出气体和尘埃形成发光的大气（彗发）和被太阳风吹出的长尾巴。离太阳越远，尾巴就越短甚至消失。
A comet is a dirty snowball of ice and dust; when it nears the Sun the ice sublimates, releasing gas and dust that form a glowing coma and a long tail blown out by the solar wind. Farther from the Sun the tail shrinks and can vanish.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#彗星 #彗发 #太阳风
太阳是什么？
What is the Sun?
太阳是距离地球最近的一颗恒星，也是太阳系的中心天体。它主要由氢和氦组成，通过核心的核聚变反应把氢变成氦并释放出巨大的光和热。太阳的质量约占整个太阳系总质量的99.86%，其引力把八大行星和其他天体束缚在各自的轨道上。
The Sun is the closest star to Earth and the central body of the Solar System. It is composed mainly of hydrogen and helium, and it releases enormous light and heat through nuclear fusion in its core, where hydrogen is converted into helium. The Sun accounts for about 99.86% of the total mass of the Solar System, and its gravity keeps the eight planets and other bodies in their orbits.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#太阳 #恒星 #太阳系
太阳有多大？
How big is the Sun?
太阳的直径约139万公里，可以装下约130万个地球，是太阳系里最大的天体。
The Sun is about 1.39 million km across and could hold roughly 1.3 million Earths—it is the largest object in the Solar System.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#太阳 #大小
为什么我们白天能看到太阳，晚上却看不到？
Why can we see the Sun during the day but not at night?
因为地球一直在自转，转到朝向太阳的一面就是白天，转到背向太阳的一面就是黑夜。太阳本身一直都在发光。
Earth constantly spins on its axis, so the side facing the Sun has daytime and the side turned away has night. The Sun itself is always shining.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#地球自转 #白天 #黑夜 #太阳
为什么金星是太阳系中表面最热的行星，甚至比离太阳更近的水星还热？
Why is Venus the hottest planet at its surface, even hotter than Mercury which is closer to the Sun?
金星表面温度高达约465°C，超过水星，主要原因是其浓厚的大气层几乎全部由二氧化碳构成，并伴随大量硫酸云，形成极强的温室效应。阳光能透入加热地表，但热量难以以红外辐射形式逸出，使热量不断积累。
Venus has a surface temperature of about 465 °C, hotter than Mercury, because its thick atmosphere is almost entirely carbon dioxide with sulfuric-acid clouds, producing an extreme greenhouse effect. Sunlight heats the surface, but the heat cannot easily escape as infrared radiation, so it builds up.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#金星 #温室效应 #二氧化碳 #行星大气