kepler-186f

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。

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。

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。

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。

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。

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。