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4.5 billion 'alien Earths' may populate Milky Way, says new study - UPI.com (blog)
URL: http://www.upi.com/blog/2013/02/07/45-billion-alien-Earths-may-populate-Milky-Way-says-new-study/5471360241600/
Submitted: Sat Feb 09 2013
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4.5 billion 'alien Earths' may populate Milky Way, says new study