Relativity is self-consistent and incorporates conservation of momentum. (Photons can carry differing amounts of energy, and therefore momentum. This is exhib

Relativity is self-consistent and incorporates conservation of momentum. (Photons can carry differing amounts of energy, and therefore momentum. This is exhibited as differing wavelengths. Specifically, light being emitted from a moving object is blue/redshifted depending on the relative motion of the observer.)