Imagine you’re in your room and you need to vacuum. The vacuum is going to suck in all of the things within a certain distance. Things beyond the suction of the vacuum won’t get sucked in.
The universe is gigantic – like its unprocessable how big it is. If the universe was the size of the earth, even the biggest black holes would be the equivalent of a vacuum cleaner.
The question you asked is kinda like asking, why aren’t all these vacuum cleaners destroying the earth.
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