All light rays from a space-time point make a space-time cone {light cone}|. All light rays to a space-time point make a light cone.
If light rays from a space-time point later converge {converging light cone}, convergence point is a singularity.
Physical Sciences>Physics>Relativity>Space-Time
5-Physics-Relativity-Space-Time
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Date Modified: 2022.0224