So this isn’t my area of science but let’s have a go.
Big objects bend space, not just black holes! This is because of Einsteins theory of general relativity. So the sun and earth and all of the other stars and planets bend space around them. Blacks holes suck everything into them and so have huge masses, this means that they also bend the space around them.
I’ll add that a black hole isn’t something you can really go through – it’s not a hole as such, anything falling into it gets squished into ‘a point of infinite density’ to quote the text book – in other words it gets compacted so much that it doesn’t have any dimensions – no height, width or depth, just mass.
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