The Photon reference article from the Simple Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Photon

Photons, in many atomic models in physics, are particles which transmit light. In other words, light is carried over space by photons.

Photons have a rest mass 0 (zero). They have mass because of Einstein's theory of relativity. At the speed of light photons do have certain mass.

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