4.5 billion 'alien Earths' may populate Milky Way - UPI.com (blog)
URL: http://www.upi.com/blog/2013/02/07/45-billion-alien-Earths-may-populate-Milky-Way-says-new-study/5471360241600/?spt%3Dhts%26or%3D7
Submitted: Fri Feb 08 2013
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CT: UFOSeek News 2013: 4.5 billion 'alien Earths' may populate Milky Way - UPI.com (blog)
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4.5 billion 'alien Earths' may populate Milky Way