Description: 恆星的宜居帶是指恆星週圍類地行星表面可以存在液態水的區域。如果地球離太陽更遠，所有地表水都會凍結；如果離太陽更近，所有地表水都會沸騰蒸發。在這兩種情況下，我們所知的生命都無法形成或存活。有時，宜居帶的概念被擴展到包括金星這樣的行星，因為金星具有失控溫室效應，即使行星離太陽更遠，液態水也可能存在。銀河系宜居帶是指銀河系中適合能夠誕育生命的行星系統生存的區域：在那裡，較重的元素應該足夠常見，類地行星由這些元素構成，而像超新星這樣威脅生命的事件應該足夠罕見。

需要注意的是，宜居帶之外也可能存在宜居條件。例如，木星的衛星木衛二上可能存在宜居的地下海洋。

Related Terms:

• 天體生物學
• Extraterrestrial Life
• 溫室效應
• Supernova
• Planetary System

Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher
The translation of this term and its definition is still awaiting approval

This is an automated transliteration of the simplified Chinese translation of this term

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