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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Related: "Saturn Moon Has Oxygen Atmosphere."

相关文章土星的卫星上有氧气吗？

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The atmosphere is about twenty-percent oxygen and eighty percent nitrogen from Earth's surface to where space begins at one-hundred-twenty kilometers up.

VOA: special.2011.04.06

He said the great machines that produced the atmosphere on the planet had stopped producing oxygen.

VOA: special.2010.07.31

If, however, they are subjected instead to pyrolysis a process of controlled burning in a low-oxygen atmosphere the result is charcoal, a substance that is mostly elemental carbon.

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Here is just one example: Single-celled marine plants produce fully half of all the oxygen in our atmosphere.

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As a result, the astronomers demonstrated in their research that the JWST should be able to detect the presence of water vapor and oxygen in an atmosphere in just a few hours of observation.

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