“宜居带”(habitable zone)其实就是指一颗恒星周围的一定距离范围，在这一范围内水可以以液态形式存在，由于液态水被科学家们认为是生命生存所不可缺少的元素，因此如果一颗行星恰好落在这一范围内，那么它就被认为有更大的机会拥有生命或至少拥有生命可以生存的环境。
然而，新发现的行星g恰好位于宜居带正中区域。
The newly-discovered planet g, however, lies right in the middle of the habitable zone.
专家们说目前发现的700多颗外部行星中，只有少部分位于宜居带当中。
Experts report that there are already more than 700 exoplanets discovered, but only a few are in the habitable zone.
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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