Albert Einstein refused to believe black holes could exist, even though his own theory showed they did.
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Today, their existence has been proved but they remain one of the greatest mysteries in theoretical physics. BBC World Service explains what we know (and what we don’t know) about this fascinating phenomenon.
00:00 Introduction
00:32 Albert Einstein's theory of relativity
01:43 Roger Penrose's new findings challenges Einstein's work
02:02 Why black hole mysteries are yet to be solved
02:47 Why a supernova is key to solving the mystery
03:34 Supermassive black holes
04:24 How the masses of the Earth & Moon distort space-time
05:07 The event horizon
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