猎户座大星云为什么受天文爱好者喜爱？
Why do amateur astronomers love the Orion Nebula?
它离我们约1300光年，是肉眼可见的恒星诞生区，用小型望远镜就能看到粉红色的云气和年轻恒星。
~1300 light-years away, it's a visible stellar nursery; even small telescopes show pinkish gas and young stars.
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)
#猎户座大星云 #恒星形成
行星状星云是怎样生成的?它名字里的“行星”与真正的行星有何关系?
How does a planetary nebula come into being, and does the planet in its name have anything to do with real planets?
由0.8至8倍太阳质量的恒星演化到渐近巨星支末期抛出外包层所致:裸露的炽热核心以强紫外辐射电离并激发周围气体发光,整个阶段仅延续约一万年。其名得自早期小型望远镜中这类天体呈如行星般的圆盘像,W. Herschel 据此命名,实则与行星毫无瓜葛;约五十亿年后太阳也将以同样方式谢幕。
It forms when a star of 0.8 to 8 solar masses sheds its envelope near the tip of the asymptotic giant branch; the bare, blazing core then floods the ejected gas with ultraviolet photons that ionize and excite it into glowing, a spectacle lasting only some ten thousand years. The name comes from the planet-like disks early small telescopes showed, a label applied by W. Herschel, though true planets play no role; the Sun will take the same curtain call in about five billion years.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
D. Osterbrock 与 G. Ferland 所著 Astrophysics of Gaseous Nebulae and Active Galactic Nuclei,University Science Books,2006年第2版
D. Osterbrock & G. Ferland, Astrophysics of Gaseous Nebulae and Active Galactic Nuclei, 2nd edition, University Science Books, 2006
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL3279602W：Astrophysics of gaseous
#行星状星云 #渐近巨星支 #电离气体
夜空里雾蒙蒙的“云”是什么？
What are the fuzzy 'clouds' in the night sky?
那是星云，由气体和尘埃组成，有的是恒星诞生的摇篮，有的是恒星死亡后抛出的物质。
They are nebulae of gas and dust—some are stellar nurseries, others material cast off by dying 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)
#星云 #气体尘埃