Say you're at the center of the expansion measuring particle-a moving away at 75% of the speed of light then turn 180 degrees and measure particle-B moving at 75% of the speed of light. Now say there is someone on particle-A and the that person particle-B is moving at 150% the speed of light but it would never be measurable to that person because they would never know that particle-B existed because the light/image of particle-B would never make it to particle-A until things slowed down enough for light to catch up.
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Say you're at the center of the expansion measuring particle-a moving away at 75% of the speed of light then turn 180 degrees and measure particle-B moving at 75% of the speed of light. Now say there is someone on particle-A and the that person particle-B is moving at 150% the speed of light but it would never be measurable to that person because they would never know that particle-B existed because the light/image of particle-B would never make it to particle-A until things slowed down enough for light to catch up.
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