Say we find an Earth twin, what do we do then?

假设我们找到地球的一个孪生兄妹，那我们做什么呢？

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While 220 miles above the Earth aboard the International Space Station, Culbertson took incredible pictures of the Twin Towers after they were struck by the hijacked jets.

在距离地球220英里的航空站，卡本特森看到了难以置信的画面，世贸中心的姊妹楼被劫持的飞机撞毁了。

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The publisher calls “Here on Earth” a twin biography, of humanity and the planet it inhabits, but that description is inadequate.

出版商称“Here on Earth”是关于人类与其所居星球的一本传记姊妹篇，而如此的描述是不够的。

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Since the very first planets outside our solar system were discovered in the early 1990s, the hope has been to find an "Earth twin" - a planet like ours, orbiting a star like ours, at a distance like ours.

BBC: Exoplanet around Alpha Centauri is nearest-ever

Venus is a twin to the Earth in terms of size and mass, yet has evolved in a very different direction, with a surface temperature hotter than a kitchen oven and a choking mixture of noxious gases for an atmosphere.

BBC: Venus mission is on

Their simulations included the effects of eclipses and tidal heating on climate for an earth-twin in orbit around a Jupiter-like gaseous giant planet.

FORBES: Earth-Like Exo-Moons Can Lurk Well Beyond Planetary Habitable Zones, Say Astronomers