Why universe can be infinite Split from http://www.sciforums.com/showthread.php?t=111573 Hmm. Why not? Our Sun is a just one among other hundred stars in our local clusters. Star clusters, bound or open, are just that : CLUSTERS. Many such clusters are organized into super clusters. These super clusters are organized into a galaxy, with a central core, every tom, dick and harry going around it. Hmmm. Galaxies in turn are organized into clusters, and super clusters etc. Till, there is "our" observable universe. All this is a matter of observed facts. But why stop there? Universe is but a mega/ giga/terra cluster of super clusters of universe. So our universe might jolly well be a part of a cluster of universes, a member of still larger cluster, till there is a super cluster of universes. Go forward, pal, you end up with an infinite number of universes spread over an illimitable space. What is there to stop you? *** A mind experiment Travel 7 billion lyrs from here. What will you find? A half empty sky? Or a sky still filled with "strange" galaxies? Go ahead and THINK, exercises your grey matter. Olber, after all, was more of a philosopher than an astronomer.