Heat death

Heat death was the result of entropy in the universe increasing to the maximum amount possible to exist. Long ago, the universe passed the point into total collapse, where heat death would be inevitable. The Logopolitans created CVEs to postpone the time until heat death occured while they would formulate a more permanent solution. Due to interference caused by The Master the CVEs closed prematurely, causing entropy to build up much faster than normal. As entropy built up, it destroyed the Logopolitans and caused their planet to crumble to dust. The entropy quickly built up and formed an entropy wave which caused heat death at any point at reached. The heat death caused by the wave destroyed planets and other astronomical objects in its path. Heat death in N-Space accounted for the destruction of Traken Union and much of everything else in the universe. The Fourth Doctor prevented the total destruction of N-Space due to heat death by redirecting this entropy into other universes, such as E-Space, through a CVE. (TV: Logopolis)

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