Quote:
Originally Posted by seebs
People often say things like "you see it instantly" because the delay introduced by light speed is so small it makes no difference, for things that are near you. For instance, if you're on the moon, and someone else is also on the moon, you see them "instantly" -- meaning the delay from light speed is too small for a human to experience it.
That doesn't mean "there's actually no delay at all, not even nanoseconds", it just means "you don't experience a discernable delay".
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We explained this to her in detail years ago, including the concept of nanoseconds, femtoseconds, etc. In one ear …