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Q

The constant Q is the ratio of two fundamental energies, and has a value of 1/100,000.

It is to do with the gravitational binding energy of a structure, and it's mass energy (mc^2).

It is important because it determines how tightly galaxies and clusters of galaxies are bound together.

A clear and detailed explanation of why it must have this value is given in the book Just Six Numbers by Martin J Rees.

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last modified 18:31 2005/02/17