在双星系统（binary system）中寻找地球 2.0

尽管天文学家已发现数千颗系外行星，但寻找类太阳恒星宜居带内的类地岩质行星仍是主要挑战。一项名为 SHERA 的美国国家航天局（NASA）小型探测器项目（Small Explorer）提出利用双星系统的复杂动力学，以探测其中的类地行星。

While astronomers have found thousands of exoplanets over the last few decades, the true prize continues to elude them - they have yet to find an Earth-mass, rocky planet orbiting in the habitable zone of a Sun-like star. That’s partially just due to cosmic geography - around half of all sun-like stars near us aren’t alone. They have one or more companion stars that complicate their orbital dynamics, as well as those of any planets they might host. But a new paper, available in pre-print on arXiv, suggests a new NASA Small Explorer mission called Searching for Habitable Exoplanets with Relative Astrometry (SHERA), which aims to use those complex dynamics to help find Earth-sized worlds in these multi-star systems.