快讯，NASA宣布：

来源: 于 2015-07-23 09:11:33 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

Astronomers have spotted the closest thing yet to the first true ‘Earth twin’ — a small planet orbiting the bright star Kepler 452, at a distance where liquid water could exist.