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...not believed to be affected by electromagnetism. This would mean that dark matter does not have a charge, and does not give off light. ...

...ance with the [[minimum total potential energy principle]], the universe's matter flows towards ever more negative total potential energy. This cosmic flow i ...ntial energy is maximal (''i.e.'', zero), while the total actual energy of matter waves is minimal (''i.e.'', zero). Therefore, at the outset of the universe ...

...e cannot know both of them about any [[particle]] (a very small thing), no matter how hard we try. The more we learn about one of such a pair, the less we ca Everything made of [[matter]] is attracted to other matter because of a fundamental force called [[gravity]]. Einstein's theory that e ...