We know that the presence of matter distorts space in a predictable fashion, as demonstrated in Newtonian theories and even in almost every circumstance in Quantum Theory as well.
We keep looking for gravity as if it were a massless particle generated by matter, when all that gravity it is is a curvature of space that ripples through the fabric of space (and time) at the speed of light through space itself. We are looking in the wrong place. This also explains why we have no trouble finding a gravity wave, because unlike gravitons -- that phenomena would be expected to be observable if all gravity is, is in fact a ripple in space-time.
Importantly, the speed of light can be slowed as it passes through matter. Indeed, it can be slowed to a ridiculously low speed in the laboratory. We can also vary the speed at which an electromagnetic field can be said to observably "travel" as well. Which leads me to my deep thought:
Quare: Can a gravitational effect on space be measurably observed to be slowed or otherwise altered in its speed by any process known to man? If not, why not?
sure enough bro...
http://www.youtube.com/watch?v=E97CYWlALEs
http://www.youtube.com/watch?v=iABmUEH5s0k
gravity is imo electromagnetism caused by the spin of electrons...directly correlated to mass.
without mass there is no gravity, imho.