joker97: General relativity has been proven beyond doubt due to the observed apparent bending of light when it passes by objects with great mass. The medium in which light (, photons) travel is gravitational field. Further insight however is only possible with the discovery of the graviton.
Well photons have mass, so we'd expect them to be effected by gravity. That doesn't prove time-space is curved, does it?
I mean that might have been taken as such when we didn't know for sure that light has mass (even though we have had light windmills for ages!). But given it has mass, surely we'd expect it's path to curve anyway even if relativity was wrong?
Photons has no mass. Anything with any mass is not capable of travelling at the speed of light without infinite energy applied.