There's two possible fates for the universe, one is called the Big Crunch, where gravity takes over and begins to pull the cosmos back, compressing to one point. Another extreme is the Big Rip, where the expansion of the universe just gets faster until galaxies, stars, planets, atoms and space itself is ripped apart.
For The Big Crunch is that's where gravity takes. For The Big RIP is where the expansion of the universe just gets faster until galaxies, planets, stars, atoms and space gets ripped apart.
