氢气海洋行星

氢气海洋行星^[1](英语：Hycean planet，Hycean 是由 hydrogen 和 ocean 两个英文字合成一个新名词），是一种假设的宜居行星，描述为热的、由水覆盖表面的行星，它的大气层含有大量氢气，可能能够孕育生命。^{[2][3][4][5][6][7][8][9][10][11]}据研究人员称，根据行星密度，氢气海洋行星可能包括类地的超级地球以及迷你海王星(如K2-18b)^[12]，因此，预计系外行星种群中的数量会很多。^[2] 氢气海洋行星可能“比之前考虑的宜居行星要大得多，半径为2.6 R⊕(2.3 R⊕)，质量为10 M⊕(5 M⊕)”。^[2]此外，此类行星的宜居带(HZ)可能“比类地行星的HZ宽得多”。地球望远镜和太空望远镜可能很快就会研究海斯行星的生命印迹，例如计划于 2021 年晚些时候发射的詹姆斯·韦伯太空望远镜 (JWST)。^[2][11]

拥有两个天然卫星的氢气海洋星球的艺术假想图。

参见

• 海洋行星
• 沙漠行星
• k2-18b
• 地球类比
• MERMOZ

参考资料

1. 香港天文应用程式2021年8月29日新闻报导
2. Madhusudhan, Nikku; Piette, Anjali a. A.; Constantinou, Savvas. Habitability and Biosignatures of Hycean Worlds. The Astrophysical Journal. 26 August 2021, 918 (1) [27 August 2021]. doi:10.3847/1538-4357/abfd9c. （原始内容存档于2022-04-28）.
3. University of Cambridge. New class of habitable exoplanets represent a big step forward in the search for life. Phys.org. 25 August 2021 [27 August 2021]. （原始内容存档于2022-05-06）.
4. Davis, Nicola. ‘Mini-Neptunes’ beyond solar system may soon yield signs of life - Cambridge astronomers identify new hycean class of habitable exoplanets, which could accelerate search for life. The Guardian. 25 August 2021 [27 August 2021]. （原始内容存档于2022-04-06）.
5. Carter, Jamie. Is Alien Life Hiding In Plain Sight? New Class Of ‘Hycean’ Planet Is Where We Should Look, Say Scientists. Forbes. 25 August 2021 [25 August 2021]. （原始内容存档于2022-04-07）.
6. Starr, Michelle. We Could Discover Alien Life on This New Class of 'Hycean' Exoplanets, Study Says. ScienceAlert. 26 August 2021 [27 August 2021]. （原始内容存档于2022-04-12）.
7. Wall, Mike. Alien life could thrive on big 'Hycean' exoplanets - Hycean planets are up to 2.5 times bigger than Earth, with oceans and hydrogen-rich atmospheres.. Space.com. 26 August 2021 [27 August 2021]. （原始内容存档于2022-05-10）.
8. Strictland, Ashley. This new class of hot ocean worlds could support life. CNN News. 26 August 2021 [27 August 2021]. （原始内容存档于2021-12-28）.
9. Irving, Michael. Say hi to Hycean worlds, a new class of exoplanet that could host life. NewAtlas.com. 26 August 2021 [27 August 2021]. （原始内容存档于2021-09-14）.
10. Staff. Astronomers Identify New Class of Exoplanets: Hycean Worlds. Science News. 26 August 2021 [27 August 2021]. （原始内容存档于2022-04-11）.
11. Staff. Alien life could be living on big 'Hycean' exoplanets. BBC News. 27 August 2021 [27 August 2021]. （原始内容存档于2022-01-06）.
12. Cohen, Liz. Scientists may find life on Earth-like planets covered in oceans within the next few years. CBS News. 27 August 2021 [28 August 2021]. （原始内容存档于2022-04-21）.