Most of this surface is sea, and the water below it—over 97% of the total on Earth—is salty.

太空看地球，水面远远多出地面，水面之下咸涩的海水在地球储水总量中的比重超过了97%。

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It is about 8 times the mass of Earth, and located in an orbit just right for liquid water to exist on the surface.

它大概是地球质量的8倍而且它所在的轨道恰好有益于在其表面有液态水的存在。

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Earth is right for life because of its gas atmosphere, surface water and moderately warm temperatures.

地球最适宜于生命的存在，因为地球有大气层、地表水和适宜的温度。

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Geological forces lifted these oil-bearing rocks up toward the surface of the earth, within reach of water and bacteria.

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But, like Larderello, today's geothermal electricity comes from unique geologies, where hot rocks and underground water sit together, close to the surface of the earth.

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Besides the larger number of emigrant rocks from its surface, Mars cooled faster than the earth after it formed, and so would have reached conditions favourable to life (a dense atmosphere, allowing for surface water) earlier.

ECONOMIST: Panspermia: Interplanetary migration | The