How do black holes work? Are they three dimensional or two dimensional? How does a solid core of a star collapse into a void?

Question

I still can’t get my head around this one. Can anyone help? I know they’re hard even for famous physicists but if anyone can simplify this concept for me I’d so appreciate it! Thank you!

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Answer 1

It’s not a void. There is matter there, and it’s so dense that not even light can escape its gravity. That’s why they appear black – light cannot escape it, and we need light to see it.