hello forum, i got another question: 1st frame of reference: a proton and its anti matter counter part are next to each other in open space. they have no relative speed to the frame of reference. suddenly they annihilate each other and a burst of energy appears. 2nd frame of reference: the same proton and its anti matter counter part are next to each other flying through space with a relative speed of 99% the speed of light. from this perspective the two particles have a mass seven times greater then their mass is in the 1st frame of reference. Since energy is being conserved in either of those frames, the annihilation of the two particles should result in a burst of energy that is seven times greater than in the first frame of reference. My question is: What is accounting for the extra energy in the second frame of reference? Is it that a part of the electromagnetic radiation(of the annihilation) has been shifted to very short wavelength and therefore very high energy radiation?