2013年1月7日 星期一

BBC News - Home: Earth-size planets 'number 17bn'

BBC News - Home
The latest stories from the Home section of the BBC News web site.
thumbnail Earth-size planets 'number 17bn'
Jan 8th 2013, 07:16

An analysis of planet candidates suggests at least one in six stars in the night sky hosts an Earth-sized planet - 17 billion in total.

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