A surface in space-time, represented as a cone in three dimensions, comprising all the points from which a light signal would reach a given point (at the apex) simultaneously, and that therefore appear simultaneous to an observer at the apex.
- Angular momentum can twist light cones and even make time travel possible in theory if not in practice.
- The future light cone represents the space that will eventually be filled by light emitted at that point.
- His work on light cones, black holes, wormholes, and time travel were are extremely revolutionary.
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