books.google.com.au - Einstein's General Theory of Relativity leads to two remarkable predictions: first, that the ultimate destiny of many massive stars is to undergo gravitational collapse and to disappear from view, leaving behind a 'black hole' in space; and secondly, that there will exist singularities in space-time...http://books.google.com.au/books/about/The_Large_Scale_Structure_of_Space_Time.html?id=QagG_KI7Ll8C&q=satisfied&utm_source=gb-gplus-shareThe Large Scale Structure of Space-Time
