question to physicist followers: is the force of gravity independent of conservation of mass? i.e. could we have a universe without gravitational force but otherwise velocity & mass would work the way we'd come to expect?
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What sets the strength of the gravitational constant in our universe? On the other hand, most physics consists of finding nice approximate models for reality, and from this (top-down, get-things-done) point of view, there are lots of perfectly fine models (universes) w/o gravity!
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