✔ 最佳答案
One model is that the universe will continue to expand until it stretches itself out and stars will burn out, the universe will freeze up.
Another model states that eventually the universe will contract, in several billion years, condense into a mass of high energy. Matter itself will cease to exist. As Woody Boyd cried on Cheers when Dr Crane explained it, "Oh no, just when things were starting to go good for me."