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It originated in 1973, when Edward Tryon proposed in the Nature journal that the Universe may have emerged from a large-scale quantum fluctuation of vacuum energy, resulting in its positive mass-energy being exactly balanced by its negative gravitational potential energy.
---by who?---> Nuclear power is believed by some to be the only suitable power source for the colonies, although there have been proposals to use concentrated starlight/sunlight and the gravitational potential energy of planets or dwarf planets with moons.