美国宇航局的“外星猎手”在“宜居带”发现首个地球大小的世界

Since its launch in April 2018, NASA’s Transiting Exoplanet Survey Satellite (TESS) has found a great number of exoplanets, including a so-called “missing link.”

自2018年4月发射以来，NASA的凌日系外行星勘测卫星(Transiting Exoplanet Survey Satellite，简称TESS)已经发现了大量的系外行星，包括所谓的“缺失的一环”。

But now, the alien planet hunter has discovered its first Earth-sized planet in a star’s “habitable zone,” an area that could allow for liquid water to be on the surface.

但是现在，“外星猎人”在一颗恒星的“宜居带”发现了第一颗与地球大小相当的行星。“宜居带”是一个允许液态水存在的区域。

Known as TOI 700 d, the planet is orbiting the star TOI 700, described as a “small, cool M dwarf star.” It is 101.5 light-years from Earth in the southern constellation Dorado. One light-year is the equivalent of 6 trillion miles.

这颗行星被称为TOI 700d，它围绕着一颗名为TOI 700的恒星运行，距离地球101.5光年，位于南天星座多拉多。一光年相当于6万亿英里。

TOI 700 d, the outermost known planet in the system, is approximately 20 percent larger than Earth and orbits the star once every 37 days, NASA added in the release.

NASA在新闻稿中补充说，TOI 700d是太阳系中已知的最外层行星，比地球大20%左右，每37天绕恒星运行一周。