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NASA discovers the closest Earth-like planet just 31 light years away
NASA发现“超级地球”：在宜居带，或有液态水
31光年
After completing its first year of observations in the southern sky, NASA"s Transiting Exoplanet Survey Satellite has spotted some intriguing （/"ɪntriːgɪŋ/）new exoplanets only 31 light-years away from Earth.
美国宇航局的过境系外行星测量卫星（TESS）在完成对南半球天空的第一年观测后，发现了几颗距离地球仅31光年的有趣的新系外行星。
·温度比太阳低40% ·
The star is 40% cooler than our sun and only about a third of the sun"s mass and size.The first exoplanet discovered around the star was GJ 357 b.
这颗恒星的温度比太阳低40%，质量和体积只有太阳的三分之一左右。科学家发现的首颗围绕这颗恒星运行的系外行星是GJ 357 b。
·体积比地球大22% ·
The exoplanet is 22% larger and 80% more massive than Earth, making it a super-Earth. The researchers estimate that it has an average temperature of 490 degrees Fahrenheit. It completes one orbit around the star every 3.9 days.
这颗系外行星体积比地球大22%，质量比地球高80%，使之成为“超级地球”。研究人员估计它的平均温度为490华氏度（约合254摄氏度）。这颗行星的公转周期为3.9天。
"We describe GJ 357 b as a "hot Earth,"" said Enric Pallé, study co-author and astrophysicist at the Institute of Astrophysics of the Canary Islands. "Although it cannot host life, it is noteworthy as the third-nearest transiting exoplanet known to date and one of the best rocky planets we have for measuring the composition of any atmosphere it may possess."
“我们将GJ 357 b描述为一个‘热地球’，”研究的合作者、加那利群岛天体物理研究所的天体物理学家恩里克·怕列说。“尽管它不能承载生命，但值得注意的是，它是迄今为止已知的‘第三近程’过境系外行星，也是可以用来测量其拥有的任何大气成分的最佳岩质行星之一。”
可能存在生命的超级星球
