The Milky Way might harbor 20 billion Earth-sized planets
Gazing up at the stars is something of a shared human experience. We look and we wonder. Are those stars like ours? Do they have planets around them? Are we alone? While ET hasn't phoned home yet, a new study from astronomers at the University of California at Berkeley and the University of Hawaii at Manoa sheds light on how many planets could resemble our own.
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