Binding energy of a galaxy?
Answers
The gravitational binding energy released in the formation of a black hole would correspond to its rest energy, i.e. to the mass of the black hole
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Binding energy is the minimum energy required to disassemble a system of particles into separate parts. This energy is equal to the mass defect - the amount of energy, or mass, that is released when a bound system is created, and is what keeps the system together. If the energy supplied is more than the binding energy, then the disassembled constituents possess non-zero kinetic energy
An explosion is probably not the way to proceed if your goal is to unbind a galaxy. One could imagine calculating the escape velocity of each star in a galaxy and somehow applying an impulse to each sufficient to accomplish the escape. A more difficult issue would be how to unbind the dark matter in each galaxy
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