If the universe is constantly expanding, how could the big crunch happen ?
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You’re right, it couldn’t! That’s why we’ve kind of settled on the idea that the big crunch probably *won’t* happen.
Obviously there’s a lot we don’t know, and a lot we *think* we know which might be wrong, but until a handful of years ago the scientific community was split on whether the universe would keep expanding forever, or if it would at some point start to contract instead, ending in a “big crunch”. More recent experiments and measurements have suggested that we’re probably looking at the first scenario. Not only is the universe expanding, but the rate of expansion is *increasing*. That would imply that the universe will probably *keep* expanding, and if that’s the case, there will be no big crunch.
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