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Entropy is surely one of the most perplexing concepts in physics. It’s variously described as a measure of a system’s disorder - or as the amount of useful work that you can get from it - or as the information hidden by the system. Despite the seeming ambiguity in its definition, many physicists hold entropy to be behind one of the most fundamental laws of physics.
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NORAD Paper:: https://web.archive.org/web/20100714011725/http://webpages.charter.net/dkessler/files/SourcesofOrbitalDebris.pdf
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