流浪行星是什么，它们为什么难以被直接探测？
What are rogue planets, and why are they so difficult to detect directly?
流浪行星是不围绕任何恒星运行、在星系中自由漂浮的行星质量天体，可能源于行星系统形成时的抛射或恒星疏散。它们自身不发光，仅靠极微弱的余热辐射，因此常规凌星和视向速度法都失效。微引力透镜是目前最有效的方法，当它们偶然掠过背景恒星前方时会使星光短暂增亮。
Rogue planets are planet-mass bodies drifting freely through the galaxy with no host star, likely ejected during the chaos of planet formation or stellar dispersal. They emit no starlight, only faint residual heat, so transit and radial-velocity methods fail. Microlensing is currently the most effective technique, briefly brightening a background star when a rogue planet passes in front of it.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-04
来源 · Source
Sumi 等《Unbound or distant planetary-mass population》（2011，Nature）；NASA 南希·格雷斯·罗曼空间望远镜
Sumi et al., Unbound or distant planetary-mass population (2011, Nature); NASA Nancy Grace Roman Space Telescope
独立核验依据 · Independent verification: 核验依据 1 Crossref DOI 10.1038/nature10092
#流浪行星 #微引力透镜 #自由漂浮天体
什么是「超级地球」？
What is a super-Earth?
超级地球是质量介于地球和海王星之间（约1至10倍地球质量）的行星，太阳系内没有此类天体。它们在外星系中非常常见，但确切的组成与形成仍存在争议。
A super-Earth is a planet with a mass between Earth's and Neptune's, roughly 1 to 10 times Earth's. The solar system has none, yet they are very common elsewhere, though their makeup and formation are still debated.
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
Chaisson & McMillan,《Astronomy Today》Pearson 多版
E. Chaisson and S. McMillan, Astronomy Today, Pearson, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 标识 /works/OL1919527W（按标识回读: Astronomy tod
#超级地球 #行星质量 #岩质 #系外行星
詹姆斯·韦伯太空望远镜如何分析系外行星的大气？
How does the James Webb Space Telescope analyze exoplanet atmospheres?
当行星从恒星前方经过时，部分星光穿过其大气边缘，大气中的分子会在特定波长吸收光，形成“透射光谱”。韦伯望远镜凭借红外灵敏度，在2022年于系外行星 WASP-39b 的大气中首次明确探测到二氧化碳，开启了细致大气刻画的新时代。
As a planet transits, some starlight passes through its atmospheric limb, where molecules absorb at specific wavelengths, creating a transmission spectrum. With its infrared sensitivity, JWST made the first clear detection of carbon dioxide in an exoplanet atmosphere (WASP-39b) in 2022, opening a new era of detailed atmospheric characterization.
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
Chaisson & McMillan,《Astronomy Today》Pearson 多版
E. Chaisson and S. McMillan, Astronomy Today, Pearson, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 标识 /works/OL1919527W（按标识回读: Astronomy tod
#透射光谱 #系外行星大气 #韦伯望远镜 #二氧化碳
如何研究系外行星的大气？
How do we study exoplanet atmospheres?
当行星从恒星前方经过时，部分星光会穿过行星大气，大气中的分子会吸收特定波长的光，留下指纹般的吸收谱线。通过对比凌星前后的光谱，天文学家能推断大气成分，如水汽、二氧化碳或甲烷。詹姆斯·韦伯望远镜正用这种方法分析遥远行星的大气。
When a planet transits its star, some starlight passes through the planet's atmosphere, where molecules absorb specific wavelengths and leave fingerprint-like lines. By comparing spectra before and during transit, astronomers infer the atmospheric composition, such as water vapor, carbon dioxide, or methane. The James Webb Telescope uses this method to analyze distant planet atmospheres.
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
Chaisson & McMillan,《Astronomy Today》Pearson 多版
E. Chaisson and S. McMillan, Astronomy Today, Pearson, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 标识 /works/OL1919527W（按标识回读: Astronomy tod
#行星大气 #凌星光谱 #成分
热木星这种近距离巨行星是如何形成的，行星迁移理论如何解释它们？
How did hot Jupiters form so close to their stars, and how does planetary migration explain them?
巨行星在距恒星较远处由冰与气体吸积形成，之后因与原行星盘的引力相互作用发生轨道迁移。盘内潮汐力矩或行星之间的引力散射可把行星推向极近的轨道，甚至形成潮汐锁定。1995年飞马座51b的发现首次证实这类天体的存在，彻底改变了行星形成理论。
Giant planets form by accreting ice and gas far from their star, then migrate inward through gravitational interaction with the protoplanetary disk. Disk torques or mutual scattering can push a planet into a very close orbit, sometimes tidally locked. The 1995 discovery of 51 Pegasi b confirmed such objects and fundamentally reshaped planet-formation theory.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-04 · 2 条独立证据
来源 · Source
Mayor 与 Queloz《A Jupiter-mass companion to 51 Pegasi》（1995，Nature）；Lin 等《Orbital migration》（1996，Nature）
Mayor & Queloz, A Jupiter-mass companion to 51 Pegasi (1995, Nature); Lin et al., Orbital migration (1996, Nature)
独立核验依据 · Independent verification: 核验依据 1 Crossref DOI 10.1038/378355a0 · 核验依据 2 Crossref DOI 10.1038/380606a0
#热木星 #行星迁移 #原行星盘
什么是系外行星的凌星时间变分（TTV）？
What is transit timing variation (TTV) for exoplanets?
凌星指行星从恒星前方经过使星光轻微变暗；凌星时间变分则是多行星系统中行星间引力扰动导致凌星时刻的偏离。TTV可用来估算行星质量并发现未被直接探测到的行星。
A transit is a planet dimming its star as it passes in front; transit timing variation is the slight shift in those transit times caused by gravitational tugs from other planets. TTV lets astronomers estimate masses and reveal otherwise unseen planets.
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
Chaisson & McMillan,《Astronomy Today》Pearson 多版
E. Chaisson and S. McMillan, Astronomy Today, Pearson, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 标识 /works/OL1919527W（按标识回读: Astronomy tod
#凌星 #凌星时间变分 #多行星系统 #引力扰动
系外行星的直接成像为何如此困难？
Why is direct imaging of exoplanets so difficult?
行星自身不发光（或极暗），且旁边的恒星亮度高出数十亿倍，直接成像极为困难。通常需要日冕仪遮挡星光，或借助引力透镜与干涉技术，目前只对年轻、远离主星的巨行星较为可行。
Planets shine only faintly while their nearby star is billions of times brighter, making direct imaging extremely hard. It usually needs a coronagraph to block the starlight or techniques like interferometry, and so far works mainly for young, widely separated giant planets.
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
Chaisson & McMillan,《Astronomy Today》Pearson 多版
E. Chaisson and S. McMillan, Astronomy Today, Pearson, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 标识 /works/OL1919527W（按标识回读: Astronomy tod
#直接成像 #日冕仪 #对比度 #系外行星
科学家如何判断系外行星是否可能有大气？
How do scientists tell whether an exoplanet might have an atmosphere?
当行星凌星时，部分星光会穿过其大气边缘，特定波长的光被大气成分吸收，留下「指纹」。通过对比凌星前后光谱，就能推断是否存在水、二氧化碳等分子。
During a transit, some starlight passes through the planet's atmospheric edge, where specific wavelengths are absorbed by its gases, leaving a "fingerprint." Comparing spectra before and during transit reveals molecules like water or carbon dioxide.
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
Chaisson & McMillan,《Astronomy Today》Pearson 多版
E. Chaisson and S. McMillan, Astronomy Today, Pearson, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 标识 /works/OL1919527W（按标识回读: Astronomy tod
#大气探测 #凌星光谱 #吸收 #系外行星
天文学家主要用哪些方法发现系外行星？
What are the main methods astronomers use to find exoplanets?
两大主流方法是凌星法与径向速度法。凌星法通过探测行星从恒星前方经过时造成的微弱亮度下降（开普勒望远镜以此发现数千颗）；径向速度法则测量行星引力使恒星产生的周期性微小摆动（多普勒效应）。
The two leading methods are the transit and radial-velocity methods. The transit method catches the tiny dimming when a planet crosses its star's face (used by Kepler to find thousands); the radial-velocity method measures the small periodic wobble a planet induces in its star via the Doppler effect.
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
Chaisson & McMillan,《Astronomy Today》Pearson 多版
E. Chaisson and S. McMillan, Astronomy Today, Pearson, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 标识 /works/OL1919527W（按标识回读: Astronomy tod
#系外行星 #凌星法 #径向速度 #开普勒
TRAPPIST-1系统有什么特别之处？
What is special about the TRAPPIST-1 system?
TRAPPIST-1是一颗约40光年外的超冷红矮星，周围有7颗地球大小的岩质行星，其中几颗位于宜居带。它是研究系外岩石行星大气的重点目标。
TRAPPIST-1 is an ultracool red dwarf about 40 light-years away with seven Earth-sized rocky planets, several in the habitable zone. It is a prime target for studying exoplanetary atmospheres.
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
Chaisson & McMillan,《Astronomy Today》Pearson 多版
E. Chaisson and S. McMillan, Astronomy Today, Pearson, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 标识 /works/OL1919527W（按标识回读: Astronomy tod
#TRAPPIST-1 #红矮星 #岩质行星 #宜居带
TRAPPIST-1系统是什么？
What is the TRAPPIST-1 system?
TRAPPIST-1是一颗距地球约40光年的超冷红矮星，周围有7颗大小接近地球的岩石行星，其中数颗位于宜居带。这些行星彼此靠得很近，从某颗行星表面甚至能看到邻星如月亮般大。它是最重要的系外行星研究目标之一。
TRAPPIST-1 is an ultracool red dwarf about 40 light-years away with seven Earth-sized rocky planets, several in the habitable zone. The planets are so close together that from one you could see a neighbor as large as the Moon in the sky. It is among the most important targets for exoplanet research.
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
Chaisson & McMillan,《Astronomy Today》Pearson 多版
E. Chaisson and S. McMillan, Astronomy Today, Pearson, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 标识 /works/OL1919527W（按标识回读: Astronomy tod
#TRAPPIST-1 #红矮星 #多行星系统
什么是「宜居带」？
What is the habitable zone?
宜居带是恒星周围温度允许液态水存在的区域，既不太热也不太冷。位于宜居带的岩质行星被认为是寻找地外生命的优先目标。
The habitable zone is the region around a star where temperatures could allow liquid water, neither too hot nor too cold. Rocky planets there are top targets in the search for life beyond Earth.
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
Chaisson & McMillan,《Astronomy Today》Pearson 多版
E. Chaisson and S. McMillan, Astronomy Today, Pearson, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 标识 /works/OL1919527W（按标识回读: Astronomy tod
#宜居带 #液态水 #岩质行星 #地外生命
科学家是怎么发现系外行星的？
How do scientists find exoplanets?
主要方法有两种：凌星法观察行星从恒星前方经过时造成的微小亮度下降，径向速度法则测恒星因行星引力产生的轻微摆动。此外还有直接成像、微引力透镜等方法。开普勒和TESS等空间望远镜主要靠凌星法批量发现行星。
The two main methods are the transit method, which catches the tiny dimming when a planet passes in front of its star, and the radial-velocity method, which measures the slight wobble a star makes under a planet's gravity. There are also direct imaging and microlensing techniques. Missions like Kepler and TESS largely rely on the transit method to find planets in bulk.
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
Chaisson & McMillan,《Astronomy Today》Pearson 多版
E. Chaisson and S. McMillan, Astronomy Today, Pearson, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 标识 /works/OL1919527W（按标识回读: Astronomy tod
#凌星法 #径向速度 #探测方法
第一颗被确认的绕类太阳恒星的系外行星是哪一颗？
What was the first confirmed exoplanet around a Sun-like star?
1995年发现的主星飞马座51（51 Pegasi）的行星51 Peg b，是第一颗被确认的绕类太阳恒星的系外行星。它是一颗热木星，这项发现获得了2019年诺贝尔物理学奖。
The planet 51 Pegasi b, found in 1995 around the Sun-like star 51 Pegasi, was the first confirmed exoplanet orbiting a Sun-like star. A hot Jupiter, its discovery won the 2019 Nobel Prize in Physics.
难度 进阶 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-11-04 · 2 条独立证据
来源 · Source
Mayor 与 Queloz《A Jupiter-mass companion to 51 Pegasi》（1995，Nature）；Lin 等《Orbital migration》（1996，Nature）
Mayor & Queloz, A Jupiter-mass companion to 51 Pegasi (1995, Nature); Lin et al., Orbital migration (1996, Nature)
独立核验依据 · Independent verification: 核验依据 1 Crossref DOI 10.1038/378355a0 · 核验依据 2 Crossref DOI 10.1038/380606a0
#51 Pegasi #热木星 #诺贝尔物理学奖 #系外行星发现
什么是“热木星”，它的发现为何令人意外？
What are “hot Jupiters,” and why was their discovery surprising?
热木星是质量接近木星、却以极近轨道（仅几天周期）绕恒星运行的气态巨行星，表面温度极高。1995年飞马座51b 的发现颠覆了“巨行星应形成于远处”的传统认识，迫使理论家重新思考行星迁移机制。
Hot Jupiters are Jupiter-mass gas giants on extremely close orbits (periods of days) with very high temperatures. The 1995 discovery of 51 Pegasi b overturned the assumption that giant planets form far out, forcing theorists to rethink planetary migration.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-04
来源 · Source
Mayor, Queloz,《A Jupiter-mass companion to a solar-type star》,Nature,1995 (DOI: 10.1038/378355a0)
Mayor, Queloz, 'A Jupiter-mass companion to a solar-type star', Nature, 1995, DOI: 10.1038/378355a0
独立核验依据 · Independent verification: 核验依据 1 Crossref DOI 10.1038/378355a0
#热木星 #51飞马座b #行星迁移 #系外行星
比邻星b为何被视为搜寻地外生命的重点目标？
Why is Proxima Centauri b considered a priority target in the search for life?
比邻星b是距离太阳系最近的系外行星，约4.2光年外，质量略大于地球且位于其红矮星宜居带内。它接收的恒星辐射虽以红外为主，但理论上表面可有液态水。欧洲南方天文台的观测在2016年确认其存在，使其成为近未来直接成像任务的首选目标。
Proxima Centauri b is the closest known exoplanet, about 4.2 light-years away, with a mass slightly above Earth's and an orbit within its red dwarf's habitable zone. Although most of its star's radiation is infrared, liquid water could in principle exist on its surface. ESO observations confirmed it in 2016, making it a top target for near-future direct-imaging missions.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
Anglada-Escudé 等《A terrestrial planet at Proxima Centauri》（2016，Nature）；欧洲南方天文台（ESO）
Anglada-Escudé et al., A terrestrial planet at Proxima Centauri (2016, Nature); European Southern Observatory (ESO)
#比邻星b #最近系外行星 #宜居带
凌星法是如何发现系外行星的？
How does the transit method discover exoplanets?
当行星从恒星前方经过时，会遮挡一小部分星光，使恒星亮度出现周期性微小下降。通过测量这种规律变暗的深度和周期，可以推算出行星的大小和轨道周期。开普勒任务正是用这种方法确认了数千颗系外行星。
When a planet passes in front of its star, it blocks a tiny fraction of the light and produces a periodic small dip in brightness. Measuring the depth and timing of these dimmings reveals the planet's size and orbital period. The Kepler mission used exactly this method to confirm thousands of exoplanets.
难度 入门 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Borucki 等《Kepler planet-detection mission》（2010，Science）；NASA 开普勒（Kepler）任务
Borucki et al., Kepler planet-detection mission (2010, Science); NASA Kepler mission
独立核验依据 · Independent verification: 核验依据 1 EUROPEPMC 标识 20056856：Kepler planet-detection mission: i
#凌星法 #系外行星 #开普勒
人类第一次发现系外行星是什么时候？
When did humans first discover an exoplanet?
1992年天文学家发现了围绕脉冲星运转的行星，1995年又确认了首颗绕类太阳恒星飞马座51运行的行星。这开启了系外行星研究的新时代，相关发现者因此获得2019年诺贝尔物理学奖。此后探测技术飞速发展，发现数量激增。
In 1992 astronomers found planets orbiting a pulsar, and in 1995 they confirmed the first planet around a Sun-like star, 51 Pegasi. This opened a new era of exoplanet research, earning the discoverers the 2019 Nobel Prize in Physics. Detection techniques then advanced rapidly, and the count soared.
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
Chaisson & McMillan,《Astronomy Today》Pearson 多版
E. Chaisson and S. McMillan, Astronomy Today, Pearson, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 标识 /works/OL1919527W（按标识回读: Astronomy tod
#系外行星 #发现史 #诺贝尔奖
宇宙里有没有像地球一样的行星？
Are there planets like Earth in the universe?
目前已在宜居带内发现一些大小接近地球、可能由岩石构成的行星，例如开普勒-452b被称为地球表亲。但要确认它们是否真正类似地球，还需要知道大气、水和是否适宜生命。这样的精确研究仍在进行中。
Astronomers have found some planets near Earth's size, likely rocky and in habitable zones, such as Kepler-452b, nicknamed Earth's cousin. Confirming whether they truly resemble Earth requires knowing their atmosphere, water, and habitability. Such precise studies are still under way.
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
Chaisson & McMillan,《Astronomy Today》Pearson 多版
E. Chaisson and S. McMillan, Astronomy Today, Pearson, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 标识 /works/OL1919527W（按标识回读: Astronomy tod
#类地行星 #宜居带 #开普勒