That's a possibility; but the observational evidence shows that the Universe is expanding faster and faster - and it seems likely that this tendency will continue in the future. It seems likely that the Universe will continue expanding exponentially, doubling in size every 10 billion years or so. Thus, it doesn't seem as if it will collapse again.
The collapse of the universe inward is called "the Big Crunch" hypothesis. It suggests that the expansion of the universe will eventually halt and reverse, leading to a collapse of all matter back into a hot, dense state. However, current observations suggest that the universe is actually expanding at an accelerating rate, which makes a Big Crunch less likely.
The universe is expanding.
Will the Universe continue expanding forever or will it collapse?
If time were to go on infinitely, the universe were to stop expanding, and the universe didn't collapse on itself or tear apart, (a lot of prerequisites, I know) then, theoretically, yes.
the opposite of expanding
It is because the Universe is expanding.
The static UNIVERSE model (not a theory) holds that our Universe has been in gravitational balance for all eternity. If general relativity correctly described gravitational interaction of matter -- and Einstein DEFINITELY believed in his model -- then the Universe would have to collapse into a singularity, a fact Einstein recognized almost immediately. He thus made this collapse disappear with a wave of his hand, saying the Universe contained a force (he called it the Cosmological Constant) that perfectly balanced against a collapse by gravity. Jesuit priest George LeMaitre showed that our Universe did not need Einstein's CC if it were expanding -- an idea Einstein ridiculed. When Edwin Hubble showed that our Universe IS, indeed, expanding; Einstein admitted his CC was his "greatest blunder."
All the available evidence strongly indicates that the Universe is, indeed, expanding.
...And the Ever Expanding Universe was created on 2009-07-14.
1. the universe continues to keep expanding 2. the universe slowly stops expanding 3. big crunch (basically the universe will stop expanding and fall back into itself)
It is not exactly expanding into anything. The galaxies are moving apart from each other, from which we can infer that the universe is expanding. Theoretically, this is a result of the Big Bang, in which the universe began when all matter was compacted into a very tiny sum, and then exploded apart in a very big bang, and as a result is still expanding today.
the universe is expanding continuously even right now as you read this little sentence I wrote.