更好的是，它处在其星系的宜居带以内，围绕恒星格利泽的轨道距离适中，液态水足以存在。

Better still, it's located in what's known as a habitable zone, orbiting Gliese at just the right distance to have liquid water.

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我们现在知道这颗行星的轨道超出了宜居带一点，因此，格利泽 581 c 的表面很可能太热而无法存在液态水。

We now know that the planet's orbit is slightly outside of the habitable zone and that, as a result, Gliese 581 c's surface is likely too warm to have liquid water.

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但要真实评估火星的宜居程度，我们还需要考虑火星的水的特性。

However, to really assess Mars' habitability we need to consider the properties of its water.

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