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http://en.wikipedia.org/wiki/Zero-energy_universe
The idea relies on negative gravitational energy, but isn't gravitational energy simply negative from convention?
http://en.wikipedia.org/wiki/Potent...ion_where_gravitational_energy_is_negative.3F
The idea relies on negative gravitational energy, but isn't gravitational energy simply negative from convention?
http://en.wikipedia.org/wiki/Potent...ion_where_gravitational_energy_is_negative.3F