The first super-Earths ever found were two of the planets around PSR B1257+12.

第一个被发现的超级地球是围绕 PSR B1257+12 运行的两颗行星。

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The mass of the smallest of these super-Earths is about four times the size of Earth.

这三颗超级地球中最小的一颗的质量大约是地球的四倍。

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For another, two other super-Earths are in the same solar system, giving us plenty to explore once we arrive.

另外，在同一星系里还有另外两颗“超级地球”。我们一旦过去，可不愁没有东西探索。

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They were also able to extrapolate whether those super-Earths were likely to be orbiting in the habitable zone around the star.

FORBES: No, Scientists Did Not Find 10 Billion Earth-Like Planets In The Galaxy

They are named super-Earths because they are more massive than the Earth but less massive than Uranus and Neptune (which are about 15 Earth masses).

BBC: Trio of 'super-Earths' discovered

Based on their findings, they were able to extrapolate that more of the stars also probably had super-Earths, based on gravitational analyses, though the planets were not definitively detected.

FORBES: No, Scientists Did Not Find 10 Billion Earth-Like Planets In The Galaxy