Quote:
Originally posted by CSflim
light has relativistic mass...but no actual mass.
In other words if you took a photon and slowed it down, and stopped it, it would be massless.
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To pick a nit, photons don't have mass, relativistic or otherwise.
What they do have is
momentum, which comes from the fact that the momentum acutually has a small speed component in addition to the well known mass component.