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Essentially, if you shot one photon of light towards the Sun, and simultaneously a photon was shot from the Sun towards Earth how long would they take to collide, considering that they're travelling towards eachother? From my understanding of relativity, it would take 8 minutes 19 seconds regardless of the fact that they're travelling towards eachother, not 4 minutes 9.5 seconds as you would think intuitively. Anyway. Help/explanations appreciated.