Milky Way Stuffed With an Estimated 50 Billion Alien Worlds UncategorizedadminFebruary 20, 2011 temp Source : http://rss.slashdot.org/~r/Slashdot/slashdot/~3/Y61v9WEcbBU/Milky-Way-Stuffed-With-an-Estimated-50-Billion-Alien-Worlds