slacktivist: Defying gravity
The problem with gravity on the quantum mechanical scale is that it doesn't quantize properly. Everything else can be broken up into these little packets of energy, even space itself, but apparently it doesn't bend right when you do that – I think they can't get mass to "couple" to space, the way charge "couples" to photons. The closest I think they've come is something called string theory, which involves a lot of arm-waving and postulating that everything is a vibrating string zipping around in something like 11 dimensions. Crazy talk. So far totally untestable, too. 😦 But it seems to be the best the scientific community has been able to come up with so far.
On the cosmic end of things, there are basically two problems:
1) Galaxies don't turn the way we'd expect them to, based on counting the stars that we can actually see…
2) Everything is moving apart, so (I think) either the speed of light hasn't always been the same, or a "dark energy" is exerting a cosmic anti-gravity force!