Since 1962 more than 30 spacecraft have made the trip to Venus, seeking to understand Earth's nearest neighbour and so-called twin planet.

1962年以来，已有30多个飞船探访了金星，试图了解这个地球的近邻和所谓的孪生行星。

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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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And as a dead planet, without water, without atmosphere, without vegetation coloration, there is nothing on the Dark Twin to change this.

作为一颗无生命的行星，没有水，没有大气，没有植被的着色，没有任何东西会改变黑暗双星的颜色。

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The newfound world, dubbed Kepler-22b, is much bigger than our planet - but, even so, it's also the smallest world yet discovered outside our Solar System, and finding it does bode well for the eventual detection of a true twin, a planet that really is a second Earth.

BBC: Viewpoint: The obsession with a 'twin Earth'

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

And it's not even that Pluto's twin, Charon, is going to be a planet too.

NPR: A Down-to-Earth View of the Planet Debate