That's what a French team did for the planet Gliese 581d, which orbits a red dwarf star about 20 light-years from Earth.

一个法国团队就对就对格雷司581d行星这样做过，这个行星环绕着距离地球20光年的一颗红矮星运转。

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Scientists were surprised by the discovery because Gliese 581d was previously ruled out as a habitable planet candidate.

科学家们对于这项发现感到非常意外，因为在此前格利泽 581d一直被排除在适宜居住的星球之外。

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In May, French astronomers identified Gliese 581d, pronounced “gleezer”, which is far closer at around 20 light years away.

今年五月，法国天文学家发现宜居行星“格利泽581d”，该行星比“开普勒22b”要近得多，距离地球约20光年。

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If that were the case, one side of Gliese 581d would be permanently lit (and heated) while the other experienced unending darkness.

ECONOMIST: Another Earth?

In its solar system there is another planet, Gliese-581d, that is also of interest in the search for life, according to the Planetary Habitability Laboratory at the University of Puerto Rico at Arecibo.

CNN: 3 new planets could host life