Then suppose only one or two of, say, ten planets per star is conducive to the formation of life, as is the case with our own solar system.
然后假设和我们的太阳系一样，每颗恒星周围每十颗行星有一颗或两颗有利于形成生命。
After that came the number of planets per star that traveled in orbits in the right locations for life to form (assuming life requires liquid water).
其三是，有每颗恒星所拥有的行星当中，到底有多少颗行星是运行在适宜生命存在的轨道上(假定生命的存在需要液态水)。
The findings, detailed in this week's issue of the journal Nature, indicate there are about two free-floating planets per star in our galaxy—and perhaps in other galaxies, too.
发现表明，在我们的银河系中每一颗恒星大约会有两个不受约束的行星。 大概其它星系也是如此。
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