I remember reading some time ago that in 2001, they discovered that the speed at which the universe was expanding was accelerating. According to current models, that would mean that the universe may expand forever and maybe even rip itself apart. But then, there is still some debate as to whether or not it will continue to accelerate. As of right now, this is how the future of the Universe looks: 1) Galaxies will be so far apart that one day we won't be able to see any other than our own. 2) Eventually, all stars will die, leaving only brown dwarfs, dead stars, and black holes. 3) All matter will eventually decay and split into subatomic particles. 4) Eventually, the only thing left will be black holes, and the temperature of the universe will go to absolute zero, reaching a state of complete disorder in which everything is the same temperature.