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Diagram of a light cone. 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.
المخروط الضوئي في فضاء ثنائي الأبعاد بالإضافة إلى بعد زمني