也就是说，在星球探索中，地球外的生命研究还仍只是一个谜。
What it means, in the bigger picture of planetary exploration and the search for life beyond Earth, is still a mystery.
在我们的有生之年，对于这些外太阳系行星大气层的研究，很有可能提供地球外存在生命的首个证据。
It is quite possible that, within our lifetimes, atmospheric studies of these extrasolar planets will provide the first evidence of biological life beyond Earth.
美国宇航局的科学家们发现，至少有七颗地球大小的行星围绕着太阳系外的一颗临近恒星运行，每颗行星都可能适宜生命体生存。
NASA scientists have discovered at least seven Earth-sized planets, each potentially capable of hosting life, orbiting a nearby star just outside the solar system.
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