Why Is Momentum Conserved in the Universe?

Bocas: The wonderful thing about science is that every answer leads to more questions. We discover whether these things are conserved by the universe, and then we get to ask, what does that mean about the nature of the universe? Why? Because i gast these questions is how we understand the universe, right? Like, it's one thing to notice trems in it, but it's another to sort of understand why the universe has these trems. And like, why do certn things they conserve and others don't? El what does it mean about the universe? Can we find some fundamental principle that tells us about all these conservation laws?"