通过观察存在于极端环境下的生物，研究人员发现液态水只能在有限范围内的温度和压力下供生物使用这些发现会让科学家对外太空生命的搜寻集中到太阳系来。 莱恩威弗说：“我们猜想在地球上找到的这些限制条件是限制所有以水为支撑的生命的基础。”

After compiling observations of life in extreme environments, the researchers found that liquid water in only a limited range of temperatures and pressures can support life.

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另外三个生命标志是水、甲烷和氧气，然而现在只有氧气还未在太阳系之外的行星中被发现。

The other three are water, methane and oxygen - and now oxygen is the only one left to be observed in the atmosphere of a planet outside the Solar System.

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戴明指出，确定水的探测技术是发现类地行星的关键步骤，这种行星可能拥有水和其他与生命相关的重要分子。

Nailing down the technique for the detection of water is a key step toward finding Earth-like planets that have water and other key life-related molecules, Deming said.

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