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Is gravity a characteristic of mass?

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My friends keep (strongly) implying that gravity is not a characteristic of mass, though I cannot think of nor find any incidence where gravity exists without it. If this is the case then does that not suggest that the planets/stars/moons etc. did not form by smaller masses colliding together to create a larger mass which attracted more mass which eventually formed a planet/star etc. but that gravity existed in these places already and the mass equivalent to the gravitational pull of that (I don't think there's a term for it sooo, G-ball) G-ball was pulled there?

 

Please try to explain with as little reference to advanced mathematics as possible as I never got much further than long division XP. Consider it anexercise in explaining General relativity to the masses XD.
asked Jan 31, 2015 in Relativity by mrgingo (120 points)
edited Jan 31, 2015 by mrgingo

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no math/no expert-------oxy. is only know non-solid with electromagnetic properties. perhaps this is a way gravity has a affect on air mass. and perhaps the elec-mag shieling around earth from solar rays.
answered Aug 11, 2015 by tim-r (160 points)
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