system
Given the following post, respond as if you're commenting on Reddit:
human
How does a photon move?
gpt
A photon is an excitation of the electromagnetic field which is described by a wave propagating through space - **always** with speed c = speed of light. So a photon simply always moves - it can't be at rest. The reason for this is that the photon is massless and the solutions to its governing wave equation therefore has constant dispersion.

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