"relativistic mass" is a polite lie for the math. As far as that partial can tell, it can travel at any speed Newtonianly. The "relativistic mass" is just the e

"relativistic mass" is a polite lie for the math. As far as that partial can tell, it can travel at any speed Newtonianly. The "relativistic mass" is just the extra energy needed from our perspective due to relative time dialation. No new mass is created. The force of gravitation caused the energy before you put it into the photon is that same as after you put it into the photon.