sandorski sandorski:
Can you explain what Gravity is?
No one can. However, the effects of gravity can be observed, quantified, and variations in gravity as an expression of mass are consistent.
Planck formulated the basis for the current consensus on gravitational theories but I side with the up and coming physicists who prefer to expand on Fock-Lorentz symmetry and, in the fringe of this group are some folks like Dr. Patrick Flanagan (UC Berkeley, Lawrence-Livermore) who've postulated that gravity is a trans-neutrino particle that exists at +C velocities.
A small school of astrophysicists are using this postulation to explain why the gravitational effects of collapsars can be observed to have an instantaneous effect on bodies well removed from the collapsar event.
So at the current time I'm of the school of thought that gravity is an expression of a particle that is currently beyond our ability to isolate but whose effects are readily observed and quantified. Given the past history of science in tending to observe the effects of particles well before they are isolated (axions, neutrinos, gluons, etc.) I imagine a gravity-inducing particle will probably be isolated in our lifetime.