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VOLUME 17 (1973) | ISSUE 8 | PAGE 424
Gravitational Interaction of Zero-mass Particles
It is shown that in a gravitational interaction of zero-mass particles the energy momentum of the system is altered during the collision, but returns to the initial value as a result of the entire collision. It is noted that in principle there can exist macroscopic bodies moving with the speed of light and having on the whole a zero rest mass.