I can't seem to find this on the Internet.... Which is most likely to occur to "end" the universe, the big freeze scenario? Or the heat death scenario?
P.s. When, if it does at all, will the universe reach absolute zero?
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You must not really have looked hard enough. They are the same phenomenon
The Big Freeze, which is also known as the Heat Death, is one of the possible scenarios predicted by scientists in which the Universe may end. It is a direct consequence of an ever expanding universe. The most telling evidences, such as those that indicate an increasing rate of expansion in regions farthest from us, support this theory. As such, it is the most widely accepted model pertaining to our universe’s ultimate fate.
There exist other scenaria for the end of the universe, like the big crunch.
Heat Death and the Big Freeze are the same thing.
Then we have alternatives, such as the Big Freeze transitioning into the new Big Bang in the Conformal Cyclic Cosmology Anyway, the short answer is nobody knows. There is too little known about the nature of Dark Energy especially to be able to say what the universe will be like in the far future.
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