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Illustration Worldline of a photon in a Minkowski diagram

Worldline of a photon in a Minkowski diagram
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A worldline of a light particle sketched in a Minkowski diagram (space-time diagram). Scale of the axes is chosen so that the photons's wordline is an angle bisector. That means: the worldlines of light particles (photons) include same angle with the position axis, as with the time axis. All physically possible worldlines are always steeper than the photon worldlines.