Helium.com | Astronomy | A look at black holes http://www.helium.com/knowledge/175159-a-look-at-black-holes.xml Helium.com > Astronomy > A look at black holes en-us Copyright Helium.com Mon, 07 Jul 2008 21:04:46 GMT Mon, 07 Jul 2008 21:04:46 GMT The Birth of a Black Hole A star a billion light years away from our own galaxy, and which contains nine solar masses and is ten times bigger than ... http://www.helium.com/items/1654863-a-look-at-black-holes Thu, 19 Nov 2009 01:30:46