Light theoretically would travel at c in a vacuum, but I think a vacuum is practically impossible. So light doesn’t ever travel at lightspeed? And therefore it does “experience” a tiny amount of time between emission and absorption/reflection?
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It doesn’t have to be a perfect vacuum. Light is only slowed down if it actually hits a particle before reaching its destination. If there are just a few particles in an area, there’s a decent chance that the light will pass through without hitting any of them.
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