"It seems very rude to come to someone's party and tell him that he lost a bet again," said cosmologist Luis Lehner of the Perimeter Institute in Ontario, Canada. Lehner did it anyway. He was speaking at a meeting to celebrate Stephen Hawking's 70th birthday. The bet in question was over whether a point of infinite density and space-time curvature, known as a singularity and usually found at the centre of a black hole, can also exist in a naked form without its black hole.
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