Eli5 if the universe is expanding, then why isn’t the earth, and everything in it (us) getting measurably bigger too?
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The universe is expanding, that doesn’t mean items within it grow, they just distance themselves from eachother and that we do observe.
Imagine a balloon you put some marbles into while it’s completely deflated. Now inflate the balloon. Marbles stay the same size but the space between them increases.
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