There are billions of galaxies in the observable universe. And each of them contains hundreds of billions of stars. In one of the galaxies, orbiting one of t...
Video link:
http://www.youtube.com/watch?v=wQOdNY-HdG0
Showing posts with label Educative. Show all posts
Showing posts with label Educative. Show all posts
Sunday, January 9, 2011
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