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How Many "dark" Contrivances?
Wed Sep 30 22:23:24 BST 2009 by Polemos
A bound system has a lower potential energy than its constituent parts; this is what keeps the system together. http://en.wikipedia.org/wiki/Binding_energy
Therefore, a gravitationally bound system, such as a galaxy, has a lower gravitational potential energy than its constituent parts. In other words, it gravitates stronger than its parts. Dimwits attribute this synergistic gravity to "dark matter."