that's true.
So how do you explain that it is deviated by a gravity field?
It's also deviated by a magnetic field,a mirror,heat,and water etc. A large gravity field warp's space,and to the outside observer,it would appear that the photon deviates from a straight line of travel. But as far as the photon is concerned,it is still traveling in a straight line. So it go's much like this-- You are in a motor vehicle,traveling down a 5km long straight stretch of road. A big giant picks up the whole stretch of road and starts to rotate it. Now,as far as those in the car are concerned,they are still traveling in a straight line down that road,but observing them from space,the vehicle would look like it is traveling in a long arc. Then there is also that big one-->E = mc^2. This means that any object that has mass,as it gets closer to the speed of light,it's mass will increase. Once at the speed of light,it's mass becomes infinite. So,if a photon had mass,and it is traveling at the speed of light,then one single photons mass would be infinite. As we know this is not the case,and the photon travels at the speed of light,then it can have no mass. Brad
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