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Aliens: Yes Or No?
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<blockquote data-quote="briggart" data-source="post: 9081857" data-attributes="member: 6805135"><p>Heat death is a mostly unrelated concept.</p><p></p><p>Basically, the Universe in future can either expand forever or collapse back on itself, depending on its total energy density*. If energy density is above a critical value, at a given point in the future the Universe will stop expanding and contract back on itself. If the density is equal or lower than this critical value, expansion will go on forever, although the expansion rate will asymptotically approach 0 if the density is equal to the critical value.</p><p></p><p>Heat death refers to a possible future state in which all the Universe is in thermodynamic equilibrium and no work is possible. Life will be impossible, but the Universe itself will continue.</p><p></p><p>* Dark energy complicates this picture somewhat, and the specific details depend on its exact nature.</p></blockquote><p></p>
[QUOTE="briggart, post: 9081857, member: 6805135"] Heat death is a mostly unrelated concept. Basically, the Universe in future can either expand forever or collapse back on itself, depending on its total energy density*. If energy density is above a critical value, at a given point in the future the Universe will stop expanding and contract back on itself. If the density is equal or lower than this critical value, expansion will go on forever, although the expansion rate will asymptotically approach 0 if the density is equal to the critical value. Heat death refers to a possible future state in which all the Universe is in thermodynamic equilibrium and no work is possible. Life will be impossible, but the Universe itself will continue. * Dark energy complicates this picture somewhat, and the specific details depend on its exact nature. [/QUOTE]
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