If you get very close to a black hole, because the gravity is so strong you get an effect where the closest parts of the Earth would be pulled towards the black hole much harder than the bits on the far side. The effect would be to rip the Earth apart into little pieces, which would spiral around the black hole until they fell into it, at which point they’d be squashed down into an incredibly small space, never to return. So let’s hope it doesn’t happen! Luckily it’s incredibly unlikely!
Another interesting thing to know is that time goes more slowly near a black hole — a consequence of the extreme gravity there.
So as you approach the black hole, time for you slows down, hence you’d be seeing everything else in the Universe speeding up, just like a movie seen in fast forward. You could effectively time travel to the future, and see the entire future of the universe unfold very quickly in front of your eyes.
Eventually of course you’ll die. Either spaghettified by gravity (your toes get pulled more strongly than your head and you are ripped apart), or incinerated by a firewall of energy. But hey, it’s been a great ride!
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