What are 2 possibilities of how our Universe will end?

The Universe recollapses in a Big Crunch. The expansion starts out rapidly, and the large amount of matter and radiation work to pull everything back together. If there's more than enough matter-and-energy, the Universe will expand to some maximum size, the expansion will reverse to contraction, and the Universe will recollapse.The Universe expands forever, resulting in a Big Freeze. Everything starts out the same as above, only this time, the amount of matter-and-energy is insufficient to counteract the expansion. The Universe keeps expanding forever, as the expansion rate keeps dropping but never reaches zero.