kepler-186f
![kepler-186f](../cache/428133.jpg)
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For a while , Kepler-452b was known for being the closest to Earth 's size . That honor now goes to Kepler-186f .
有段时间,开普勒-452b以体积最接近地球而闻名,而现在,开普勒-186f获此殊荣。
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Kepler-186f could easily be so cold that any water there is frozen , unless it has a greenhouse-like atmosphere that can trap heat , they said .
他们说,开普勒-186f很可能非常寒冷,水是冰冻状态的,除非那里有一个类似温室的环境,能够使热量滞留。
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Both its Earthlike size and its location in the habitable zone are what make Kepler-186f a more likely candidate to accommodate life .
体积与地球相差无几、同样位于宜居带,这两个条件使开普勒-186f成为候选的宜居星球。
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Given its small size , the researchers believe that Kepler-186f is most likely a rocky planet , but they don 't have enough information to calculate its actual composition or mass .
鉴于开普勒-186f的体积较小,研究人员认为它最有可能是一颗岩态行星,但他们没有足够多的信息来计算出其实际成分或质量。
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Known officially as Kepler-186f , the planet is the outermost of five Earth-sized worlds orbiting in that star 's solar system , the scientists said at a news conference held Thursday by the space agency .
科学家周四在NASA举办的新闻发布会上说,这颗行星的正式名称为开普勒-186f(Kepler-186f),其所处的太阳系有五颗地球大小的行星,它是最外面的一颗。
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Kepler-186f is an exoplanet orbiting the star Kepler-186 about 500 light-years from Earth . Discovered in 2014 , it is the first Earth-size exoplanet found to be orbiting in its star 's habitable zone .
开普勒-186f距离地球约500光年,是一颗围绕开普勒-186运行的太阳系外行星。开普勒-186f于2014年被发现,是首颗在恒星的宜居带内被发现的类地系外行星。