Is Momentum Still a Law?

One of the most important laws, or at least the most useful laws, is the idea that momentum is conserved. A lot of things that you learn btin grade school that you thought were conserved in the universe are not. But consurvation and momentum still holds as far as we know. Some laws have been repealed. They made it all the way up to the port of the universe an then think i shot down yit were like newtonian physics.