Some researchers think that Titan, with its thick atmosphere and lakes of liquid methane, is the likeliest spot to find extraterrestrial life in our solar system.

一些研究人员认为，拥有厚厚大气层和液态甲烷湖的“泰坦”是太阳系内最有可能发现地外生命的天体。

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Other planets in our solar system lack the oxygen atmosphere that helps explain why life exists on Earth.

我们太阳系的其他行星缺乏氧气大气层，这有助于解释为什么地球上存在生命。

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The absence of an oxygen atmosphere on Mars and other planets in our solar system means that these planets also lack an ozone shield that would protect surface-dwelling life from UV radiation.

在火星和我们太阳系的其他行星上没有氧气，这意味着这些行星也缺乏保护地表生物免受紫外线辐射的臭氧层。

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The discovery of more than 330 planets outside our solar system in recent years has helped refine the number of life forms that are likely to exist.

BBC: Number of alien worlds quantified