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Some physicists believe that the world, and in fact the entire universe will eventually end. This belief is based on the fact that currently the universe is constantly expanding. This expansion is due to the fact that there a small amount of heat (a few degrees above absolute zero) in the universe. Heat is the source of all movement, for when there is no heat, there can be no movement. Eventually, as the theory goes, the universe will cool down to absolute zero, and when this occurs our world and everything else for that matter will basically implode. But no need to worry, that wont happen in our lifetime.

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13y ago

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