Mass has gravity, as far as we know completely unhindered by anything and everything, each electron has a nonzero gravitational pull on every other electron in the universe
does Energy (light/radio waves etc) have a similar gravitational force?

Mass has gravity, as far as we know completely unhindered by anything and everything, each electron has a nonzero gravitational pull on every other electron in the universe
does Energy (light/radio waves etc) have a similar gravitational force?
Yes. AFAIK, light and energy do curve space as well. E=mc^2 and all that.
Energy and mass are interchangable, so if a particle has energy, it also has mass. Electromagnetic radiation is affected by gravity, which is why a black hole has an event horizon.
Yes, but you need to be careful.Originally Posted by Booms
In GR gravity is the result of curvature of spacetime and that curvature is determined by the stressenergy tensor.
Elements of that tensor include density of mass/energy, momentum and pressure, This tensor is an invariant, and is independent of the observer, so it is a bit more complicated than just finding mass from and plugging it into the Newonian .
Not only does energy cause curvature, gravitational energy also causes curvature, and hence gravity gravitates.
http://en.wikipedia.org/wiki/Stressenergy_tensor
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