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Message: <blockquote data-quote="Bullgrit" data-source="post: 6256922" data-attributes="member: 31216">Does a photon have a measurable lifespan, relative to itself? I mean, a photon that travels 1,000 light years has a lifespan of 1,000 years relative to us, the observer. But the photon traveled at c, so ... instantaneous/simultaneous beginning and end, relative to itself?It seems to me, that if it has a measurable lifespan relative to itself, time for it isn't "stopped." But if it doesn't have a measurable lifespan relative to itself, can it be said to exist?Also, is there any proof that time reverses at speeds beyond c? Is it just theory, (can't be proved, right)? Could it be that faster than c speed won't create a paradox?Bullgrit</blockquote>