'The book is a masterpiece, written by sure hands.' Science
'Certain to rank as an outstanding classic of the current advance of relativity theory.' Contemporary Physics
'La parution de ce livre est un événement important …' La Recherche
This 1973 book discusses Einstein's General Theory of Relativity and its 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 itself.