Although our solar system only has one star, most stars like our sun are not solitary, but are binaries where two stars orbit each other a pair, or multiples involving even more stars.

虽然我们的太阳系只有一颗恒星，但其实大部分和我们太阳相似的恒星都不是单个的，而是由两个恒星相互旋转组成的双星系统，或者甚至包含更多恒星的多星系统。

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In a one-star system like our solar system, the leading theory as to how the planets formed is through a process called accretion.

在单星系如我们的太阳系中，普遍认定行星是通过吸积的过程逐渐形成的。

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There isn't anywhere like the Earth in the solar system, so we would have to go to another star.

在太阳系中没有一个地方像地球，所以我们必须到另一颗恒星上去。

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This implies that one solar-like star out of three harbours such planets.

BBC: Trio of 'super-Earths' discovered

Lying only 10 light years away in the equatorial constellation of Eridanus, it was already known to harbor at least one extra-solar Jupiter-like planet, which orbits the star roughly every 7 years.

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