Possible end scenarios

Overview
It has been studied that the Dark Matter that exists in our universe will eventually lead to its end. This page lists all the theories that scientist thought of about the end of the universe.

Big Freeze (or Big Chill)
In this scenario, the Universe keeps expanding at the same ratio forever until the gas required to create stars is over. The Universe will then slowly turn into a cold place that will reach a temperature near 0° K. Black holes will then dominate the universe until they disappear due to Hawking Radiation.

Heat Death
This scenario supposes that the universe will reach a maximum state of entropy in which the energy is evenly distributed (to explain better, the entropy is a value associated with systems in disorder, thus if it reaches the maximum value, the system will not be in disorder anymore, and with the system the energy will be "in order" too) and the energy will not be enough to execute energetic processes (life too).

Big Rip
The Big Rip supposes that the current acceleration rate of the expansion of the universe will first increase the space between galaxies. A further expansion will first break large structures such as galaxies, then smaller structures until every existing body will be broken into particles.

Death Knight
As told in the Prophecies of The Instant End of Universes, a Death Knight sent by the Epsilon Oligarchy will radiate our Omniverse with extreme heat and then erase it forever.

The Death Knight, taking the role of an Angel of Death, will then turn the energy of the destroyed Megaverse into Stardust Energy for unknown plans.

Big Crunch
This theory assumes that, as the universes started his expansion due to its density, still thanks to its density the universe will invert its expansion process and begin to shrink. The result will be a dimensionless singularity.

Big Bounce
In this more specific theory, once the the universe will be shrinked into a 0D point, the high density matter will burst in another Big Bang which will recreate another universe, repeating the process forever.

Big Slurp
According to this theory, another universe inside our own may create. This universe will be in a lower energy state and will start expanding until our universe gets destroyed.