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Originally Posted by AntonioLao GUILLE,
The lightcone separates spacetime into three regions: timelike region, lightlike region, and spacelike region. The speed of a particle in the timelike region is less than lightspeed, equal lightspeed in the lightlike region, and superluminal in the spacelike region. |
What about space-timelike regions? with space-time particles? what speed is it?