科学家如何证明木卫二冰壳之下存在海洋？
How did scientists demonstrate an ocean beneath Europa's icy crust?
伽利略号探测器发现，木卫二在木星磁场中穿行时会产生感应磁场，这是其内部存在导电层的最有力证据，而最合理的导电层就是咸水海洋。与此同时，木卫二表面的裂缝、碎冰块和“混沌地形”表明冰壳一直在缓慢活动，表面年龄极轻。潮汐加热则为海洋保持液态提供了持续能量。据此估算，木卫二的海洋深度可能达数十到上百公里。
The Galileo spacecraft found that Europa generates an induced magnetic field as it moves through Jupiter's magnetosphere, the strongest evidence for an electrically conductive layer beneath the surface, most plausibly a salty ocean. At the same time, the moon's surface cracks, ice rafts and chaotic terrain reveal ongoing crustal activity and a very young surface age. Tidal heating supplies the energy that keeps the ocean liquid. Estimates put the ocean's depth at tens to more than a hundred kilometers.
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）
#木卫二 #地下海洋 #感应磁场
为什么木卫一拥有太阳系最活跃的火山？
Why does Io host the most volcanically active surface in the solar system?
木卫一与木卫二、木卫三处于轨道共振之中，导致木星的巨大潮汐力周期性挤压和拉伸它。潮汐摩擦把机械能转化为热量，使木卫一内部保持部分熔融。这些热量驱动了数百座活火山，喷出硫和二氧化硫，形成黄橙色的硫沉积地表。木卫一由此成为太阳系中火山活动最活跃的天体，也是除地球外唯一确认正在喷发的天体。
Io is locked in orbital resonance with Europa and Ganymede, so Jupiter's enormous tides alternately squeeze and stretch it. Tidal friction converts this mechanical energy into heat, keeping the interior partially molten. That heat drives hundreds of active volcanoes erupting sulfur and sulfur dioxide, coating the surface in yellow-orange sulfur deposits. Io is thus the most volcanically active body in the solar system and the only one besides Earth confirmed to be erupting today.
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 #火山 #潮汐加热
国际天文学联合会如何定义“行星”？
How does the IAU define a 'planet'?
按国际天文学联合会2006年的定义，行星须绕太阳公转、自身引力使其近似球形、并已清空轨道附近的其他天体。冥王星因未满足第三条而被归为矮行星。
Per the IAU's 2006 definition, a planet orbits the Sun, is round from its own gravity, and has cleared its orbital neighborhood. Pluto fails the third criterion and is a dwarf planet.
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）
#行星定义 #IAU
土星卡西尼环缝内缘处，环粒子公转周期恰约为卫星土卫一的一半。这种整数比对应背后是怎样的共振动力学？
At the inner edge of Saturn's Cassini Division, ring particles orbit with periods close to exactly half that of the moon Mimas. What resonance dynamics lie behind this integer ratio?
该半径构成与土卫一的2:1平运动共振：粒子每绕土星两圈，便在同一相对方位受到一次土卫一的引力牵引，同相位的重复摄动不断泵大轨道偏心率。偏心率增大使粒子径向运动加剧、碰撞更频繁，耗散与角动量交换遂将物质清出共振带，留下宽约4800千米、边缘锐利的空隙。
This radius forms a 2:1 mean-motion resonance with Mimas: every two orbits a particle completes about Saturn, it receives one tug from the moon at the same relative position. Perturbations recurring in phase coherently pump up orbital eccentricity. The enlarged radial excursions intensify collisions among neighboring particles, and the resulting dissipation and angular-momentum exchange sweep material out of the resonance zone, leaving a gap about 4,800 kilometers wide with sharply defined boundaries.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
C. D. Murray 与 S. F. Dermott，《太阳系动力学》，剑桥大学出版社，1999年。
C. D. Murray & S. F. Dermott, Solar System Dynamics, Cambridge University Press, 1999.
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL6617934W：Cambridge University Pr
#平运动共振 #土卫一 #卡西尼环缝 #轨道偏心率
开普勒第三定律能用来算什么？
What can Kepler's third law be used to calculate?
它把行星轨道周期的平方与轨道半长轴的立方联系起来，可据此推算天体距离或质量。
It links the square of the orbital period to the cube of the semi-major axis, letting us infer distances or masses.
难度 专业 · 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）
#开普勒第三定律 #周期
海王星上的『大黑斑』是什么？
What was the Great Dark Spot on Neptune?
大黑斑是1989年旅行者2号发现于海王星南半球的一个巨型风暴系统，面积接近地球大小。它类似木星大红斑，但由甲烷吸收使暗区呈现深蓝黑色。有趣的是，后来观测发现它已消失，说明海王星大气变化很快。
The Great Dark Spot was a giant storm in Neptune's southern hemisphere spotted by Voyager 2 in 1989, about the size of Earth. Like Jupiter's red spot but appearing dark blue-black from methane absorption, it later vanished in later observations, showing Neptune's atmosphere changes fast.
难度 专业 · 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 #大黑斑 #风暴
为什么火星是红色的？
Why is Mars red?
火星土壤富含氧化铁（铁锈），使表面呈红色。
Iron-oxide dust gives the surface its red color.
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）
#氧化铁 #土壤 #火星
毅力号火星车在耶泽罗撞击坑发现了什么？
What has the Perseverance rover found at Jezero crater?
耶泽罗是约 38 亿年前的一个湖泊遗址，具备河流入湖的三角洲沉积。毅力号确认了这里的古三角洲和湖底碳酸盐岩，并在岩石中采集了多份样品管，计划由后续任务送回地球分析。这些样品可能保存着火星早期环境甚至生命活动的痕迹。
Jezero is the site of a lake that existed some 3.8 billion years ago, with a river delta feeding into it. Perseverance has confirmed the ancient delta and lakebed carbonates there, and has sealed rock samples in tubes for a future mission to return to Earth. Those samples may preserve traces of early Martian environments or life.
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 #毅力号 #古湖泊
为什么金星是太阳系中最热的行星？
Why is Venus the hottest planet in the solar system?
金星表面被浓厚的二氧化碳大气和硫酸云包裹，强烈的温室效应把热量牢牢锁住，使其表面温度高达约465℃，比离太阳更近的水星还热。
Venus is wrapped in a thick CO₂ atmosphere and sulfuric clouds; a runaway greenhouse effect traps heat, pushing its surface to about 465°C—hotter than Mercury, which is closer to the Sun.
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）
#金星 #温室效应
天王星为什么躺着自转？
Why does Uranus roll on its side as it rotates?
天王星自转轴倾斜约 98°，几乎横躺在轨道面上，一般认为是在形成早期被一个地球大小的天体猛烈撞击所致。
Uranus's spin axis is tilted about 98°, nearly lying in its orbital plane; this is thought to result from a violent collision with an Earth-sized body early in its history.
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 #撞击
木星上的大红斑是什么？
What is the Great Red Spot on Jupiter?
大红斑是木星上持续了至少三百年的巨型风暴，是一个比地球还大的反气旋漩涡，颜色来自大气中的复杂化学物质。
The Great Red Spot is a giant storm on Jupiter that has raged for at least 300 years—an anticyclonic vortex larger than Earth, colored by complex chemicals in the atmosphere.
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）
#木星 #大红斑
好奇号火星车发现了什么与生命相关的物质？
What life-related material has the Curiosity rover found?
好奇号在盖尔撞击坑的泥岩中检测到了多种有机分子，包括含碳的复杂化合物，并发现甲烷浓度会随季节变化。有机分子本身不等于生命，但它们是生命的前体物质，证明火星在过去能够保存有机碳。
Curiosity has detected a variety of organic molecules, carbon-bearing compounds, in the mudstones of Gale crater, and has observed that methane levels vary with the seasons. Organic molecules are not life itself, but they are building blocks of life and show that ancient Mars could preserve organic carbon.
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 #好奇号 #有机分子
水星那么热，为什么两极却可能有冰？
Mercury is scorching hot, so why might its poles still harbor ice?
水星自转轴几乎不倾斜，两极有些永久阴影的撞击坑从未被阳光直射，温度低至约 -200℃，从彗星撞击带来的水或太阳风氢氧结合的水得以以冰的形式保存。
Mercury's axis is barely tilted, so some polar impact craters stay in permanent shadow and never receive direct sunlight, reaching about -200°C; water delivered by comet impacts or formed from solar-wind hydrogen and oxygen can survive there as ice.
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 #冰 #撞击坑
水星表面有什么特殊地貌？为什么它很热却仍可能藏有水冰？
What special features does Mercury's surface have, and why might it hold water ice despite extreme heat?
水星表面布满撞击坑，最大的撞击盆地是直径约 1550 公里的卡洛里斯盆地，内部由多环结构环绕。在水星两极的永久阴影坑内，雷达观测发现了疑似水冰的反射信号，那里的温度常年低于零下 170 摄氏度，冰可以长期保存。
Mercury's surface is heavily cratered; its largest impact basin, Caloris, is about 1,550 km wide and surrounded by concentric rings. Radar observations have detected bright reflections consistent with water ice inside polar craters in permanent shadow, where temperatures stay below about minus 170 degrees Celsius year-round, so ice can survive for long periods.
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 #卡洛里斯盆地 #水冰
金星表面为什么如此炽热？金星是什么样的世界？
Why is Venus' surface so hot, and what kind of world is it?
金星被浓密的二氧化碳大气和硫酸云包裹，大气压约为地球的 90 倍，温室效应使其表面温度高达约 460 摄氏度，比水星还热。金星的表面布满火山地貌和缓慢流动的熔岩平原，过去可能长期处于火山活动状态。
Venus is wrapped in a dense carbon-dioxide atmosphere with sulfuric-acid clouds at about 90 times Earth's pressure; the runaway greenhouse effect heats its surface to about 460 degrees Celsius, hotter than Mercury. Its surface is covered with volcanic landforms and slowly moving lava plains, and it was probably volcanically active for 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）
#金星 #温室效应 #火山
水星离太阳最近，为什么白天和夜晚的温差能超过 600℃？
Mercury is closest to the Sun, so why can the temperature difference between its day and night sides exceed 600°C?
水星几乎没有大气层来重新分配热量，向阳面被烈日烤到约 430℃，背阳面热量迅速散失到太空，降至约 -180℃，因此昼夜温差极大。
Mercury has almost no atmosphere to redistribute heat; the sunlit side bakes to about 430°C while the night side radiates heat into space and drops to about -180°C, producing an enormous day-night swing.
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 #行星科学 #温度
为什么巨行星的光环都紧贴行星本体，而卫星只能在更远处形成？洛希极限如何划出这条界线？
Why do giant planets' rings hug the planet itself while satellites form only farther out? How does the Roche limit draw this boundary?
行星引力随距离变化，天体近侧与远侧所受引力之差即潮汐力。在洛希极限以内，潮汐力超过冰质碎块的自引力，物质无法聚结成卫星，只能摊薄成环；越过极限后自引力重占上风，碎片便能吸积长大为卫星。土星明亮的主环恰位于其洛希极限之内，紧贴环系外缘的牧羊犬卫星正是这条分界线的直观标志。
A planet's pull weakens with distance, so the difference in gravity across a body—the tidal force—grows toward the planet. Inside the Roche limit this force exceeds the self-gravity binding icy rubble together, so material cannot coalesce into moons and spreads into rings instead; beyond the limit self-gravity wins and debris accretes into satellites. Saturn's bright main rings sit inside its Roche limit, and the shepherd moons hugging their outer edge neatly mark this boundary.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-04
来源 · Source
Esposito,《Planetary Rings》,剑桥大学出版社,2014 (DOI: 10.1017/cbo9781139236966)
Esposito, 'Planetary Rings', Cambridge University Press, 2014, DOI: 10.1017/cbo9781139236966
独立核验依据 · Independent verification: 核验依据 1 Crossref DOI 10.1017/cbo9781139236966
#行星环 #洛希极限 #潮汐力
太阳系中风速最快的行星是哪颗？
Which planet has the fastest winds in the solar system?
海王星拥有太阳系最猛烈的风暴，风速可超过 2000 km/h，远超地球飓风，其能量来源至今未完全弄清。
Neptune hosts the solar system's most violent winds, exceeding 2000 km/h—far faster than Earth's hurricanes—and their energy source is still not fully understood.
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 #风暴 #风速
行星绕太阳的轨道是什么形状？
What shape are the orbits of planets around the Sun?
开普勒第一定律说行星的轨道是椭圆，太阳坐在其中一个焦点上，圆只是偏心率等于零的特例。平方反比引力下的束缚解本来就是圆锥曲线，椭圆是其中不逃逸的那一类。多数行星的偏心率小于 0.1，看着几乎正圆，偏心率最大的水星也才 0.2 出头。易混的是：太阳在焦点而非中心，行星到太阳的距离在一年里确有变化，但季节并不来自它；何况行星互相摄动，真实轨道也不是闭合的完美椭圆。
Kepler's first law says the orbit of a planet is an ellipse with the Sun at one of its two foci, and a circle is only the special case of zero eccentricity. The bound solutions of an inverse-square gravitational force are conic sections anyway, the ellipse being the class that does not escape. Most planets have eccentricities below 0.1, so their orbits look almost circular, and even Mercury, the most eccentric of them, is just over 0.2. The easy mistake: the Sun sits at a focus rather than the center, so a planet's distance from the Sun really does change over a year, but the seasons do not come from that; and since the planets perturb one another, a real orbit is not a perfectly closed ellipse either.
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）
#开普勒 #椭圆轨道
天王星为什么呈现蓝绿色？
Why is Uranus blue-green?
天王星大气中含有甲烷，甲烷会吸收红光、反射蓝绿光，使星球呈现青蓝色。它的大气以氢氦为主，甲烷只占约2%，但足以决定颜色。低温也使它成为太阳系最冷的行星之一。
Uranus has methane in its atmosphere, which absorbs red light and reflects blue-green light, giving the planet its cyan color. Its air is mostly hydrogen and helium with only about 2 percent methane, yet that is enough to set the hue. Its low temperature also makes it one of the coldest planets.
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 #甲烷 #大气
火星的极冠主要由什么物质组成？为什么会随季节变化？
What are Mars' polar caps made of, and why do they change with the seasons?
火星北极有一层由水冰构成的永久极冠，厚度可达数公里；南极永久极冠则以二氧化碳干冰为主，其下覆盖着水冰。冬季大气中的二氧化碳凝结到极冠上，使极冠明显扩大，春季干冰升华又使其缩小。这种季节性的二氧化碳循环导致火星两极的大小年复一年地涨落。
The permanent northern polar cap of Mars is made of water ice several kilometers thick, while the permanent southern cap is dominated by carbon-dioxide ice, with water ice beneath it. In winter, carbon dioxide from the atmosphere condenses onto the caps, making them expand dramatically, and in spring the dry ice sublimates away, shrinking them. This seasonal carbon-dioxide cycle drives the annual waxing and waning of the Martian polar caps.
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 #极冠 #干冰
科学家如何根据撞击坑来推测行星表面的年龄？
How do scientists estimate the age of a planetary surface from impact craters?
原理是撞击坑越多，表面就越古老：古老表面经历了更长时间的陨石轰击，坑密度更高。用月球上已经精确测定年代的岩石对撞击坑密度进行校准，就可以把火星、水星等天体表面的坑密度换算成绝对年龄。
The principle is that more craters mean an older surface: ancient surfaces have endured bombardment longer and carry higher crater densities. By calibrating crater density against precisely dated lunar rocks, densities on Mars, Mercury and other bodies can be converted into absolute ages.
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）
#撞击坑 #表面年龄 #行星地质
奥林帕斯山和水手谷为什么被认为是太阳系最壮观的地貌？
Why are Olympus Mons and Valles Marineris considered the most spectacular landforms in the solar system?
奥林帕斯山是太阳系最高的火山，高出火星基准面约 21 公里，宽达 600 公里；水手谷则是太阳系最大的峡谷系统，绵延约 4000 公里。由于火星没有板块运动，火山可以在固定热点上持续堆积，形成巨大的盾状火山。水手谷则主要由地壳拉伸（裂谷作用）形成，并与塔尔西斯隆起造成的应力密切相关。
Olympus Mons is the tallest volcano in the solar system, rising about 21 km above the Martian datum and spanning 600 km, while Valles Marineris is the largest canyon system, stretching roughly 4,000 km. With no plate tectonics on Mars, volcanoes pile up over fixed hot spots, building giant shield volcanoes. Valles Marineris formed mainly through crustal extension (rifting), closely linked to the stresses produced by the Tharsis uplift.
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 #奥林帕斯山 #水手谷
火星过去温暖湿润，为什么今天变得寒冷干燥？
Mars was once warm and wet, so why is it now cold and dry?
关键原因之一是火星失去大气：火星没有全球性磁场，太阳风能直接剥离大气分子，MAVEN 探测器证实大气正以每秒约 100 克的速度持续流失。随着大气变薄，温室效应减弱，地表液态水蒸发或冻结，火星演化成今天寒冷干燥的沙漠世界。
One key cause is that Mars lost its atmosphere: lacking a global magnetic field, the solar wind strips atmospheric molecules directly, and the MAVEN spacecraft has measured losses of roughly 100 grams per second. As the atmosphere thinned, the greenhouse effect weakened, surface water evaporated or froze, and Mars became the cold, dry desert world of today.
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）
#火星 #大气逃逸 #太阳风
天王星和海王星为什么呈蓝绿色？
Why are Uranus and Neptune blue-green?
它们大气中的甲烷吸收红光、反射蓝绿光，使两颗冰巨星呈现青蓝色，其中海王星因更活跃的大气显得更蓝。
Methane in their atmospheres absorbs red light and reflects blue-green light, giving both ice giants a cyan hue; Neptune looks bluer due to more active atmospheric processes.
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）
#天王星 #甲烷 #颜色
气态巨行星有什么特点？
What are the characteristics of gas giants?
气态巨行星（如木星、土星）主要由氢和氦组成，没有固体表面，体积巨大、拥有众多卫星和壮观的行星环。
Gas giants like Jupiter and Saturn are made mostly of hydrogen and helium with no solid surface, are enormous, and often have many moons and rings.
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）
#气态巨行星 #巨行星
为什么金星上的一天比一年还长？
Why is a day on Venus longer than its year?
金星自转极慢，转一圈约需243个地球日，而它绕太阳一圈只要225个地球日。它还是自东向西反着转的，所以在金星上太阳会从西边升起。
Venus turns extremely slowly, needing about 243 Earth days for a single spin, while it circles the Sun in only 225 Earth days. It also rotates backwards, so on Venus the Sun rises in the west.
难度 入门 · 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）
#金星 #自转
木星的大红斑会消失吗？
Could Jupiter's Great Red Spot disappear?
过去一百多年的观测显示，大红斑一直在变小、变得更圆，内部风速却略有增加。它可能在未来某一天解体，但科学家还无法预测具体时间。
Records from the past century show the Great Red Spot shrinking and growing rounder, even as its inner winds speed up slightly. It may break apart some day, though scientists cannot yet predict when.
难度 入门 · 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）
#木星 #大红斑
土星的光环是用什么做成的？
What are Saturn's rings made of?
土星的光环是数不清的冰块和石块，绕着土星一起转。它们大多像雪球那么小，也有几块像房子那么大。
Saturn's rings are countless chunks of ice and rock circling the planet together. Most pieces are as small as snowballs, though a few are as big as a house.
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）
#土星 #光环
矮行星和行星的区别到底在哪里？
What exactly separates a dwarf planet from a planet?
两者都绕太阳运行，也都被自身引力压成近似球形，关键差别在于有没有清空轨道附近的小天体。冥王星、谷神星和鸟神星都没做到这一点，所以归入矮行星。
Both orbit the Sun and both are rounded by their own gravity, but a planet must also have swept its orbital neighbourhood clear. Pluto, Ceres and Makemake have not managed that, so they are classed as dwarf planets.
难度 入门 · 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）
#矮行星 #分类
什么是类地行星？
What is a terrestrial planet?
类地行星是具有岩石固体表面的行星，如水星、金星、地球和火星，它们相对小巧、密度高。
Terrestrial planets have solid rocky surfaces, like Mercury, Venus, Earth, and Mars—relatively small and dense.
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）
#类地行星 #岩石行星
木星有卫星吗？
Does Jupiter have moons?
木星的卫星很多，已经确认的有九十多颗，其中最大的四颗用小望远镜就能看到。木卫二的冰壳下面可能藏着一片海洋。
Jupiter has many moons, more than ninety confirmed, and the four largest can be spotted with a small telescope. One of them, Europa, may hide an ocean beneath its icy shell.
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 #卫星
土星的光环会一直存在吗？
Will Saturn's rings last forever?
观测发现环上的物质正缓慢落向土星，这个过程被称为环雨。按目前速度，光环可能在一亿年左右的尺度上明显变淡。对人类来说，这仍然是极其漫长的时间。
Measurements show ring material slowly raining down onto Saturn, a process nicknamed ring rain. At the present rate the rings could fade noticeably over something like a hundred million years. On human timescales that is still almost forever.
难度 入门 · 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）
#土星 #环雨
地球是什么形状的？
What shape is the Earth?
地球是一个大圆球，从太空看是蓝蓝的、圆圆的。它的腰部还稍微鼓出来一点点。
Earth is a big ball that looks round and blue from space. It bulges just a little around its middle.
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 #形状
水星离太阳最近，为什么不是最热的行星？
Mercury is closest to the Sun, so why isn't it the hottest planet?
水星几乎没有大气层，白天吸到的热量很快就跑掉了，夜里冷得能结冰。金星有厚厚的大气把热量锁住，平均温度反而更高。
Mercury has almost no atmosphere, so the heat it soaks up by day escapes quickly and its nights turn freezing. Venus keeps its heat locked in under a thick atmosphere, which makes it hotter on average.
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）
#水星 #温度
火星上有水吗？
Is there water on Mars?
火星的两极和地下藏着大量水冰，探测车还在岩石里找到过古代液态水留下的矿物痕迹。今天火星表面气压太低、温度太冷，液态水很难长期存在。
Mars holds plenty of water ice at its poles and underground, and rovers have found minerals that only form in ancient liquid water. Today the surface is too cold and the air pressure too low for liquid water to last.
难度 入门 · 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）
#火星 #水冰
木星上那个大红点是什么？
What is the big red spot on Jupiter?
那是一场超级大风暴，名字叫大红斑，已经刮了好几百年。这场风暴比整个地球还要宽。
It is a giant storm called the Great Red Spot, and it has been spinning for hundreds of years. The storm is even wider than our whole 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）
#木星 #大红斑
冥王星为什么不再算行星了？
Why is Pluto not called a planet anymore?
天文学家重新定下了行星的规矩，冥王星太小，轨道旁边还有很多小伙伴挤在一起。于是大家改叫它矮行星。
Astronomers agreed on new rules for planets, and Pluto is small with many icy neighbours sharing its path. So now it is called a dwarf planet.
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）
#冥王星 #矮行星
海王星是怎样被算出来的？
How was Neptune calculated into existence?
19 世纪天文学家发现天王星轨道偏离预测，推断外侧有未知行星的引力扰动，勒维耶用数学算出位置，伽勒据此在 1846 年观测到海王星。
In the 19th century, observed deviations in Uranus's orbit implied an unseen perturbing planet; Le Verrier computed its position mathematically, and Galle observed Neptune in 1846 based on that prediction.
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）
#海王星 #数学 #发现
类地行星和气态巨行星为什么差别这么大？
Why are the rocky planets and the gas giants so different?
太阳系形成时内圈温度很高，只有岩石和金属能凝结，所以水星到火星都是小而致密的岩石世界。外圈足够冷，冰和气体也能聚集，行星因此长得又大又轻。木星和土星就以氢和氦为主。
When the Solar System formed, the inner region was hot and only rock and metal could condense, so Mercury through Mars became small, dense worlds. Farther out it was cold enough for ice and gas to gather, letting planets grow huge and light. That is why Jupiter and Saturn are mostly hydrogen and helium.
难度 入门 · 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）
#行星形成 #太阳系
什么样的天体才能叫行星？
What does an object need in order to be called a planet?
按国际天文学联合会的规定，行星要绕着太阳运行，自身引力把它压成接近球形，还要清空轨道附近的其他小天体。三条都满足，才算真正的行星。
The International Astronomical Union says a planet must orbit the Sun, be round because of its own gravity, and have cleared other small bodies from its orbit. Only an object that meets all three rules counts.
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）
#行星 #定义
火星上会刮沙尘暴吗？
Does Mars have dust storms?
火星经常刮沙尘暴，有的大到笼罩整个星球，能持续好几个星期。那里的空气很稀薄，所以风虽然吹得远，力气却不算大。
Mars has frequent dust storms, and some grow large enough to cover the whole planet for weeks. Its air is very thin, so the wind travels far but does not push very hard.
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）
#火星 #沙尘暴