什么是椭圆星系？
What is an elliptical galaxy?
椭圆星系外形接近椭球、缺乏明显旋臂和大量气体尘埃，恒星大多年老，新恒星形成很少，是宇宙中常见的星系形态之一。
Elliptical galaxies are oval-shaped with little gas or dust and few spiral arms; their stars are mostly old, and they form few new stars—a common galaxy type.
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
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#椭圆星系 #星系形态
旋涡星系的旋臂是怎样维持形状的？
How do spiral galaxies keep their arms?
旋臂并非由固定恒星组成，而是“密度波”——林家翘与徐遐生提出的理论中，引力波般的密度波绕星系缓慢旋转，压缩经过的气体触发恒星形成，使旋臂表现为明亮的新生恒星带，从而长期维持形态。
Spiral arms are not made of fixed stars but are “density waves.” In the Lin–Shu theory, wave-like compressions rotate slowly through the galaxy, squeezing passing gas to trigger star formation, so arms appear as bright bands of new stars and persist 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：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。
林家翘与徐遐生（Lin-Shu，1964–1969，星系密度波理论）
Lin & Shu density-wave theory (1964–1969)
#旋臂 #密度波 #恒星形成 #星系动力学
什么是星系的旋转曲线，它如何暗示暗物质？
What is a galaxy rotation curve, and how does it hint at dark matter?
观测显示，星系外缘恒星的旋转速度远高于仅由可见物质引力所能解释的值。这表明星系被大量不可见的暗物质晕所包围，是暗物质存在的关键证据之一。
Observations show that stars at a galaxy's edge orbit faster than the visible matter's gravity alone can explain. This implies galaxies are wrapped in massive invisible dark-matter halos, a key piece of evidence for dark matter.
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
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#旋转曲线 #暗物质晕 #星系动力学 #引力
星系形态的密度依赖（环境熄火）如何由 SDSS 数据证实？
How is the density-dependent morphology (environmental quenching) of galaxies confirmed by SDSS data?
SDSS 大样本显示星系形态随局域密度变化：高密度环境（星系团中心）以早型（椭圆）星系与熄火星系为主，低密度场星系多为旋涡且恒星形成活跃。这种形态–密度关系是星系并合、潮汐剥离等环境熄火机制的证据。
Large SDSS samples show galaxy morphology tracks local density: high-density environments (cluster cores) are dominated by early-type (elliptical) and quenched galaxies, while low-density field galaxies are mostly spirals with active star formation. This morphology–density relation evidences mergers, tidal stripping, and environmental quenching.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Dressler 1980, ApJ 236, 351《富星系团中的星系形态》
Dressler (1980), ApJ 236, 351, 'Galaxy morphology in rich clusters: Implications for the formation and evolution of galaxies'
独立核验依据 · Independent verification: 核验依据 1 CROSSREF 标识 10.1086/157753：Galaxy morphology in rich clu
#形态-密度关系 #环境熄火 #SDSS
活动星系核与类星体的能量来源是什么？
What powers active galactic nuclei and quasars?
活动星系核是位于某些星系中心、异常明亮的致密区域，其能量来自超大质量黑洞吸积周围气体时释放的引力能，可将物质加热到极高温度并发出从射电到 X 射线的全波段辐射。类星体是其中极其遥远、明亮的活动星系核。
An active galactic nucleus (AGN) is an unusually bright, compact region at a galaxy's center powered by a supermassive black hole accreting gas, releasing gravitational energy that heats matter to extreme temperatures and emits across the spectrum. Quasars are very distant, luminous AGN.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Peterson（1997，《活动星系核导论》，剑桥大学出版社）
B. M. Peterson (1997, An Introduction to Active Galactic Nuclei, Cambridge Univ. Press)
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL3280556W：An introduction to acti
#活动星系核 #类星体 #超大质量黑洞 #吸积盘
什么是活动星系核（AGN）？
What is an active galactic nucleus (AGN)?
活动星系核是某些星系中心异常明亮的区域，能量来自中心的超大质量黑洞吸积物质时释放的巨大引力能。类星体是其中极亮而遥远的一类。
An active galactic nucleus is an unusually bright center of a galaxy, powered by a supermassive black hole accreting matter and releasing huge gravitational energy. Quasars are among the brightest and most distant examples.
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
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#活动星系核 #超大质量黑洞 #吸积 #类星体
星系团中重子的缺失如何由 X 射线与引力透镜联合约束？
How is the missing-baryon accounting in clusters constrained by combining X-ray and lensing?
引力透镜直接测出星系团总质量，X 射线测出星系团内介质气体的重子质量，二者之比与宇宙重子分数对照即可检验重子是否缺失。结果显示 ICM 贡献了星系团内大部分重子，但某些星系团的总重子分数偏低，需用丢失重子或温热弥漫介质解释。
Lensing directly measures total cluster mass, while X-rays measure the ICM gas baryon mass; their ratio versus the cosmic baryon fraction tests for missing baryons. ICM holds most cluster baryons, yet some clusters show low total baryon fractions, invoking missing baryons or warm-hot intergalactic medium.
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
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#失踪重子 #星系团 #引力透镜
星系是什么？
What is a galaxy?
星系是由引力束缚在一起的大批恒星、星际气体、尘埃和暗物质的巨大集合体。小的星系只有几百万颗恒星，大的星系可达数万亿颗。银河系只是宇宙中数千亿个星系之一。
A galaxy is a vast collection of stars, interstellar gas, dust, and dark matter all bound together by gravity. Small galaxies hold only a few million stars, while large ones contain trillions. The Milky Way is just one of hundreds of billions of galaxies in the universe.
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
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#星系 #恒星集合 #宇宙结构
哈勃深场图像揭示了什么？
What did the Hubble Deep Field images reveal?
哈勃深场通过长时间曝光一小片看似空旷的天空，揭示出其中数以千计的遥远星系。它表明宇宙中的星系数量以千亿计，并展示了星系随宇宙时间的演化。
By staring at a tiny, seemingly empty patch of sky for a long exposure, the Hubble Deep Field revealed thousands of distant galaxies. It showed that the universe holds hundreds of billions of galaxies and captured their evolution over cosmic time.
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
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#哈勃深场 #深空成像 #遥远星系 #宇宙
星系之间碰撞时会发生什么？
What happens when galaxies collide?
星系碰撞时恒星之间几乎不会直接相撞，因为彼此距离极其遥远，但引力会扭曲星系形状并触发大量新恒星诞生。气体云碰撞压缩后会爆发式形成恒星，最终两个星系会并合成一个更大的椭圆星系。银河系与仙女座的合并就是未来的例子。
When galaxies collide, their stars almost never hit each other because they are so far apart, but gravity distorts the galaxies and triggers bursts of new star formation. Colliding gas clouds compress and form stars explosively, and the two galaxies eventually merge into a larger elliptical. The future merger of the Milky Way and Andromeda is one such example.
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
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#星系碰撞 #并合 #恒星形成
暗物质晕的浓度–质量关系暗示了怎样的宇宙结构形成层级？
What hierarchical structure formation does the dark-matter halo concentration–mass relation imply?
在 ΛCDM 框架下，低质量暗物质晕更早坍缩、因而浓度更高，大质量晕较晚聚集、浓度偏低，形成倒挂的浓度–质量关系。这一层级成团（小结构先形成、再并合成大结构）与 N 体模拟和弱透镜观测相符。
In ΛCDM, low-mass halos collapse earlier and are thus more concentrated, while massive halos assemble later and are less concentrated—an inverted concentration–mass relation. This hierarchical clustering (small structures first, later merging into larger ones) matches N-body simulations and weak-lensing data.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-04
来源 · Source
Navarro, Frenk, White,《A Universal Density Profile from Hierarchical Clustering》,The Astrophysical Journal,1997 (DOI: 10.1086/304888)
Navarro, Frenk, White, 'A Universal Density Profile from Hierarchical Clustering', The Astrophysical Journal, 1997, DOI: 10.1086/304888
独立核验依据 · Independent verification: 核验依据 1 Crossref DOI 10.1086/304888
#暗物质晕 #浓度-质量 #层级成团
类星体有多亮？
How bright are quasars?
类星体是宇宙中最亮的活动星系核，其光度可超过整个银河系的数百倍，能量却集中在小于太阳系尺度的区域内。其能量来自中心超大质量黑洞的吸积。
Quasars are the brightest active galactic nuclei, shining hundreds of times brighter than an entire galaxy while fitting inside a region smaller than the solar system. Their power comes from accretion onto a central supermassive black hole.
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
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#类星体 #光度 #超大质量黑洞 #活动星系核
仙女座星系与银河系未来会相撞吗？
Will the Andromeda Galaxy and the Milky Way collide in the future?
会的。哈勃太空望远镜的观测与模拟显示，仙女座星系正以约每秒110公里的速度向银河系靠近，两者预计在约40至50亿年后发生并合，最终形成一个更大的椭圆状星系。
Yes. Hubble observations and simulations show Andromeda is approaching the Milky Way at about 110 km/s, and the two are expected to merge in roughly 4–5 billion years, eventually forming a larger elliptical-like galaxy.
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
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#仙女座 #星系并合 #哈勃 #银河系未来
银河系的旋臂是什么？
What are the spiral arms of the Milky Way?
旋臂是旋涡星系中恒星和气体相对密集的弯曲条带，像风车叶片一样从中心伸出。银河系主要有英仙臂、盾牌-半人马臂等数条大旋臂。旋臂并非固定结构，而是恒星和气体在密度波中聚集形成的波纹。
Spiral arms are curved bands where stars and gas are relatively dense, extending from a galaxy's center like the blades of a pinwheel. The Milky Way has several major arms such as the Perseus and Scutum-Centaurus arms. The arms are not fixed structures but density waves where stars and gas bunch up like a traffic jam.
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
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#旋臂 #密度波 #银河系
什么是旋涡星系？
What is a spiral galaxy?
旋涡星系拥有扁平的盘状结构和旋臂，恒星与气体沿旋臂集中，银河系和仙女座星系都属于旋涡星系。
A spiral galaxy has a flat disk with arms where stars and gas concentrate; the Milky Way and Andromeda are spirals.
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
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#旋涡星系 #星系类型
星系之间会互相碰撞吗？
Do galaxies collide with each other?
会。星系在引力作用下可能相互靠近并合并，恒星本身很少直接相撞，但气体云会被压缩从而触发大量新恒星诞生；银河系未来也将与仙女座星系合并。
Yes. Galaxies can merge under gravity; individual stars rarely collide, but gas clouds compress and spark star formation. The Milky Way will one day merge with Andromeda.
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
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#星系碰撞 #仙女座
哈勃的星系“音叉图”按什么对星系分类？
How does Hubble's galaxy “tuning fork” classify galaxies?
哈勃在1926年提出的分类图将星系按形态分为椭圆星系、透镜状星系和旋涡（及棒旋）星系，形似音叉。它反映了星系外观的系统差异，但后来发现形态更多由演化与环境影响，而非简单的线性序列。
Hubble's 1926 classification diagram sorts galaxies by shape into ellipticals, lenticulars, and spiral (including barred-spiral) galaxies, arranged like a tuning fork. It captured systematic appearance differences, though we now know morphology is shaped more by evolution and environment than a simple linear sequence.
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。
埃德温·哈勃（1926，《星云的星系外天文学》分类论文）
Edwin Hubble (1926, galaxy classification)
#哈勃分类 #星系形态 #旋涡星系 #椭圆星系
什么是本星系群？
What is the Local Group?
本星系群是包括银河系、仙女座星系和三角座星系在内的约50个星系组成的松散集合，直径约1000万光年。
The Local Group is a loose gathering of about 50 galaxies, including the Milky Way, Andromeda, and Triangulum, spanning roughly 10 million light-years.
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
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#本星系群 #银河系 #仙女座 #星系集合
什么是星系团？
What is a galaxy cluster?
星系团是由成百上千个星系在引力下聚集成的更大结构，其间充斥着高温X射线气体和大量暗物质，是宇宙中的“城市”。
A galaxy cluster is a gravitationally bound collection of hundreds to thousands of galaxies, filled with hot X-ray gas and dark matter—cities of the cosmos.
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
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#星系团 #宇宙结构
银河系中心的超大质量黑洞叫什么，我们如何得知它的存在？
What is the supermassive black hole at the Milky Way's center, and how do we know it exists?
银河系中心被称为人马座 A*（Sgr A*）的射电源，质量约400万个太阳质量。天文学家通过长期追踪周围恒星的紧密高速轨道（如 UCLA 银河系中心组和事件视界望远镜的观测）推断出这一致密质量的存在。
The radio source Sagittarius A* (Sgr A*) at the Milky Way's center has a mass of about four million Suns. Astronomers inferred this compact mass by tracking the tight, fast orbits of nearby stars over many years (work by the UCLA Galactic Center Group and imaging by the Event Horizon Telescope).
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：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。
事件视界望远镜合作组（EHT，2022）；加州大学洛杉矶分校银河系中心研究组
Event Horizon Telescope Collaboration (2022); UCLA Galactic Center Group
#人马座A* #超大质量黑洞 #银河系中心 #事件视界望远镜
星系自转曲线平坦化为何被视为暗物质存在的证据？
Why is the flattening of galaxy rotation curves taken as evidence for dark matter?
按可见物质（恒星与气体）的引力，外围恒星转速应随半径增大而下降；但 21 厘米氢线观测显示许多旋涡星系的自转曲线在远处保持平坦。这需要额外的、不可见的质量（暗物质晕）在外围提供引力，是最早的暗物质证据之一。
Visible matter alone predicts outer stellar speeds should decline with radius, yet 21 cm HI observations show many spirals have flat rotation curves far out. This requires extra invisible mass—a dark-matter halo—providing gravity at large radii, among the earliest dark-matter evidence.
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
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#自转曲线 #暗物质晕 #21厘米线
本星系群包含哪些主要成员，它的尺度有多大？
What are the main members of the Local Group and how large is it?
本星系群是以银河系与仙女座星系（M31）为首、约 80 个星系组成的松散集团，直径约 1000 万光年（约 3 Mpc）。它的第三大成员是三角座星系（M33），其余多为矮椭圆与矮不规则星系。
The Local Group is a loose association of about 80 galaxies led by the Milky Way and Andromeda (M31), spanning roughly 10 million light-years (about 3 Mpc). Its third-largest member is Triangulum (M33); the rest are mostly dwarf ellipticals and irregulars.
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。
van den Bergh 1999, Astron. Astrophys. Rev. 9, 273《本星系群》
van den Bergh (1999), Astron. Astrophys. Rev. 9, 273, 'The local group of galaxies'
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL27771W：The galaxies of the Local · 核验依据 3 CROSSREF DOI 10.1007/s001590050019（独立回读: The local group
#本星系群 #仙女座 #银河系
旋涡星系与椭圆星系在恒星种群和气体含量上有何不同？
How do spiral and elliptical galaxies differ in stellar populations and gas content?
旋涡星系保留丰富的冷气体与尘埃，持续形成年轻蓝星，旋臂清晰；椭圆星系则几乎耗尽冷气体，以年老、偏红的星族为主，形态光滑无旋臂。这反映了两者不同的并合与恒星形成历史。
Spiral galaxies retain rich cold gas and dust, host ongoing star formation with young blue stars, and show clear arms; ellipticals have exhausted cold gas, are dominated by old, redder populations, and are smooth and armless—reflecting different merger and star-formation histories.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Binney & Merrifield《银河天文学》（Princeton University Press 1998）
Binney & Merrifield, Galactic Astronomy (Princeton University Press, 1998)
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-691-02565-0 (Princeton University Press)
#旋涡星系 #椭圆星系 #恒星种群
什么是本超星系团（拉尼亚凯亚），它如何被划定？
What is the Laniakea supercluster and how is it delineated?
拉尼亚凯亚超星系团是包含本星系群、室女座星系团等约十万个星系的引力归属区域，由星系共同流向巨引源的宇宙流划定边界。它刷新了人们对银河系在宇宙中邻里尺度的认识。
Laniakea is the supercluster containing the Local Group, the Virgo Cluster, and some 100,000 galaxies, delineated by the cosmic flow—galaxies' common motion toward the Great Attractor. It redefined our picture of the Milky Way's cosmic neighborhood.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Tully, Courtois, Hoffman & Pomarède,《The Laniakea supercluster of galaxies》,Nature 513, 71-73 (2014)
R. B. Tully, H. Courtois, Y. Hoffman & D. Pomarède, 'The Laniakea supercluster of galaxies', Nature 513, 71-73 (2014)
独立核验依据 · Independent verification: 核验依据 1 DOI 10.1038/nature13674
#拉尼亚凯亚 #本超星系团 #宇宙流
星系团中为何存在大量高温弥漫的星系团内介质（ICM）？
Why does a galaxy cluster harbor large amounts of hot diffuse intracluster medium (ICM)?
星系团引力势阱极深，落入其中的气体被激波与湍流加热到 10 的 7 次方至 8 次方开尔文，发出 X 射线，这就是星系团内介质。它包含的普通物质质量往往超过所有成员星系恒星的总和，是星系团质量的主要可见部分之一。
Clusters have very deep gravitational wells; gas falling in is heated by shocks and turbulence to 10^7–10^8 K and emits X-rays—this is the intracluster medium. Its ordinary matter often exceeds the total stellar mass of all member galaxies and is a major visible component of cluster mass.
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
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#星系团内介质 #X射线 #星系团
仙女座星系是什么？
What is the Andromeda Galaxy?
仙女座星系是离银河系最近的大型旋涡星系，距离约250万光年，肉眼在晴朗夜空可见为一个模糊光斑。它比银河系略大，拥有约一万亿颗恒星。根据观测，仙女座星系正以每秒约110公里向银河系靠近，约40多亿年后两者将相撞合并。
The Andromeda Galaxy is the nearest large spiral galaxy to the Milky Way, about 2.5 million light-years away, visible to the naked eye as a faint smudge on clear nights. It is slightly larger than the Milky Way and hosts about a trillion stars. Observations show it approaching us at about 110 km/s and will collide and merge with the Milky Way in some 4 billion years.
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
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#仙女座 #邻近星系 #星系碰撞
星系有哪几种主要形态？
What are the main shapes of galaxies?
按哈勃分类，星系主要分为椭圆星系、旋涡星系（含棒旋星系）和不规则星系。旋涡星系有明显的旋臂，椭圆星系呈椭球状且恒星较年老。
In Hubble's classification, galaxies are mainly elliptical, spiral (including barred spirals), and irregular. Spirals show clear arms, while ellipticals are ellipsoidal and made of older stars.
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
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#星系形态 #哈勃分类 #椭圆星系 #旋涡星系
什么是星系团和超星系团？
What are galaxy clusters and superclusters?
星系团是由引力束缚在一起的成百上千个星系的集合，例如室女座星系团。多个星系团再聚成更大尺度的超星系团，如包含银河系的本星系群所在的拉尼亚凯亚超星系团。这些结构是宇宙大尺度纤维状网络中的节点。
A galaxy cluster is a gravitationally bound collection of hundreds to thousands of galaxies, such as the Virgo Cluster. Clusters in turn group into even larger superclusters, like Laniakea, which contains our Local Group including the Milky Way. These structures are nodes in the universe's vast filamentary web.
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
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#星系团 #超星系团 #宇宙网
星系是如何分类的？
How are galaxies classified?
哈勃在1920年代提出用形态分类的哈勃序列，把星系分为椭圆星系、旋涡星系（含棒旋）和不规则星系。椭圆星系形似椭球、恒星形成活动少，旋涡星系有明显的盘和旋臂。这套形态分类至今仍是描述星系的基础框架。
In the 1920s Hubble proposed the Hubble sequence, classifying galaxies by shape into ellipticals, spirals (including barred spirals), and irregulars. Ellipticals look like ellipsoids with little star formation, while spirals have a disk and arms. This morphological scheme remains the basic framework for describing galaxies.
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
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#哈勃序列 #椭圆星系 #旋涡星系
银河系大概有多大？
How big is the Milky Way?
银河系是一个直径约10万光年的棒旋星系，包含约1000亿到4000亿颗恒星，太阳位于距离中心约2.7万光年的旋臂上。
The Milky Way is a barred spiral about 100,000 light-years across with 100–400 billion stars; the Sun sits on a spiral arm about 27,000 light-years from the center.
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
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#银河系 #大小
什么是星系？
What is a galaxy?
星系是由恒星、气体、尘埃和暗物质在引力下聚集而成的庞大系统，比如我们的银河系就包含上千亿颗恒星。
A galaxy is a vast system of stars, gas, dust, and dark matter bound by gravity; our Milky Way holds hundreds of billions of stars.
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
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#星系 #银河系
我们所在的银河系是什么样的？
What does our Milky Way galaxy look like?
银河系是一个棒旋星系，由数千亿颗恒星、气体、尘埃和暗物质组成，整体像一个带旋臂的大圆盘。太阳系位于距中心约2.7万光年的一个旋臂上。从侧面看它是一条横贯夜空的朦胧光带，所以叫银河。
The Milky Way is a barred spiral galaxy made of hundreds of billions of stars, gas, dust, and dark matter, shaped like a great disk with spiral arms. Our Solar System sits on a spiral arm about 27,000 light-years from the center. Seen from the side, it appears as a hazy band of light across the night sky, which is why it is called the Milky 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
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#银河系 #棒旋星系 #旋臂