[rleigh]

Maybe our assumptions about how momentum, gravity and inertia work are incomplete. General and special relativity describe it as a warping of spacetime, but while I've read all sorts about the equations, I have not yet read any description of how that phenomenon physically manifests (I'm not a physicist). Maybe relativity works well enough, but doesn't describe things completely, just like Newton's laws weren't complete and were superseded by relativity.