The singularity, which lies at the centre of a black hole, is where gravity is the strongest., Some astronomers, who have studied space for many years, believe that black holes are tunnels to other universes., Stellar black holes form from large, dying stars which have a mass ten times more than the mass of our Sun., The explosion that happens when a star dies is called a supernova., John Mitchell - who was a scientist alive hundreds of years ago - had many questions about gravity.,

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