Another comment explained how NASA works hard to avoid collisions, but the ISS has had a few collisions including one that went through the big manipulator arm so the reality is that we’ve just been lucky enough not to have anything catastrophic happen yet.
There are a few designs being tossed around I think for way to try and clean up the junk that isn’t going to de-orbit on its own any time soon which will get more and more important as time goes on
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