4 June 2011 Updated at 20:53 ET
Moons like Earth's could be more common than we thought
Jason Palmer
Science and technology reporter, BBC News
The interactions that form comparatively large moons like our own were thought to be rare
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About one in 10 rocky planets around stars like our Sun may host a moon proportionally as large as Earth's, researchers say.
link-
http://www.bbc.co.uk/news/science-environment-13609153