Some of the planets in our Solar System will be absorbed into the Sun when it expands into a red giant. Others may wind up being either sucked in or pushed away, doomed to wander between the stars. But eventually, many trillions of years into the future, the universe as we know it will probably be a cold, dead, expanding cloud of dust and debris, expanding into infinity, with nothing to show that it was ever more than that.

And then another big bang? :-))