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美国太空总署近日宣布,又发现219颗疑似系外行星,其中包括10颗可能适宜人类居住的类似行星。这10颗行星大小与地球相仿,温度适中,星球上可能有液态水。而是否存在液态水是一个星球是否宜居的一个关键特征。美国太空总署还表示,测定宜居星球在星系中的出现频率十分必要,因为只有了解宜居星球出现的频率,才能更好地制定寻找“另一个地球”的战略。
NASA recently announced that it has found 219 suspected extrasolar planets, including 10 similar planets may be suitable for human habitation. These 10 planets are similar in size to the earth, with moderate temperatures and possibly liquid water on the planet. Whether or not liquid water is a key feature of a planet is livable. NASA also said it is necessary to measure the frequency of a livable planet in galaxies because a better strategy for finding “another planet” can only be developed by understanding how often the livable planet appears.