我们实际上改变了地球大气层的化学成分。
We have literally altered the chemistry of our planet's atmosphere.
莫纳克亚山坐落在太平洋上，峰顶高出地球大部分的稠密大气层，那里的条件使望远镜能够获得无比清晰的图像。
Rested in the Pacific Ocean, Mauna Kea's peak rises above the bulk of our planet's dense atmosphere, where conditions allow telescopes to obtain images of unsurpassed clarity.
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。
Other planets in our solar system lack the oxygen atmosphere that helps explain why life exists on Earth.
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