When it comes down to it, black holes are not as menacing as their reputation suggests, explains Professor Tamara Davis.
BOILER-PIPE: The astronaut falling into the black hole doesn't experience that time slowing, though. To them, it seems like their clock ticks away happily and they experience time flowing normally. Instead, they see your clock behaving strangely. As they cross the event horizon, they might not even notice. It is only when they attempt to escape that they would find the effort futile.
Compress the whole Earth into the volume of a teaspoon and you'd have a black hole To turn the Sun into a black hole you'd have to squish it into something the size of Earth. Once you've compressed something so much that no quantum physics effects can beat gravity anymore, there is nothing left to prevent gravity having its way completely — such that everything is pulled into a point of infinite density right at the centre, far inside the event horizon. That is the singularity.
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