Some time ago, in 2007, young Stephen - of apocryphal black hole fame - took a ride in the Vomit-Comet:
Well, it seems that the professor has subsequently changed his mind about black holes and now questions their existance:
http://www.nature.com/news/stephen-hawking-there-are-no-black-holes-1.14583
Took a spell of zero gravity to clear his mind?
Cheers - Dai.