Eli5 if the universe is expanding, then why isn’t the earth, and everything in it (us) getting measurably bigger too?

Question

Eli5 if the universe is expanding, then why isn’t the earth, and everything in it (us) getting measurably bigger too?

In: 4

Answer 1

Metric expansion is incredibly weak over distances smaller than galaxy clusters, so you just don’t see any local changes. Gravity can easily overwhelm metric expansion, although if metric expansion continues to accelerate indefinitely, you end up with a “Big Rip” scenario.