Light cone
Set of spacetime events, light-connected to a given event / From Wikipedia, the free encyclopedia
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Not to be confused with Cone cell or Cone of light.
In special and general relativity, a light cone (or "null cone") is the path that a flash of light, emanating from a single event (localized to a single point in space and a single moment in time) and traveling in all directions, would take through spacetime.