“JeffT”: “Do angels have mass? If not, then they can travel at infinite speeds.”
Actually, according to the proven mathematical principles of Albert Einstein, nothing can exceed the speed of light. That is because the massless particles of light, or photons, manifest as perturbations – i.e., waves – propagating throughout the Higgs field (the quantum particle of which being the Higgs boson). And, as such, they must conform to that maximum speed of the relaying interaction of those Higgs field waves.