What are the possible futures of the universe?

I need help describing the possible futures of the universe.


I'm required to list the factors that influence which future will actually occur. Can anybody help me? Where is this universe headed? Thanks alot!|||1. (Most Likeliy) Big Rip


2. Heat Death


3. Big Crunch


4. Big Bounce (infinte Big Bangs and Big Crunches)


5. Other





It should be noted that I listed these in order of likelihood ignoring Quantum Physics. A cyclical model of the universe is technically possible, when that field is applied, even to the Big Rip fate.








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The biggest (currently unknown) factor is the value of Dark Energy [(w) in most equations]. If it is at a certian quantity, the universe will expand and find equilibirum over time. If it is too strong, the universe will "rip" apart, even at the atomic levels. If it is too weak, the universe will collapse in on itself (gravity overpowers the expansion in the end) and it crunches.|||The universe is expanding. Also, it is proved that the sun will be a red giant and there may be dangers to humans.