If light travels at 670 million miles per hour, then that means in one hour it will travel 670 million miles. At 2 hours it will travel 1214 million miles etc. This to me sounds like a measurement of time, just on such a huge scale that we can’t comprehend it. But in the grand scheme of the cosmos this is not that crazy of a scale. I would think it’s just saying light doesn’t experience time *relative* to us. But Einstein says no- no matter what, light’s speed doesn’t change and, what, relativity just doesn’t matter? It feels like a paradox
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You’re movement through space and time are related, think of them as two numbers that add up to 1, change one number and the other will always change to balance the equation. I’m a way you’re always moving at the speed of light, but you’re experience of time is nearly 1 and your speed is low.
So if you’re not moving at all your speed is 0 and your perception of time is 1, you experience time as drawn out as possible. If you accelerate to half the speed of light your experience of time drops and the journey seems to take half as long as others would perceive it.
Take that to its final extreme and traveling at the speed of light the experience of time drops to zero so from your perspective your journey will be instant even though though years could have passed traveling.
As for why this happens, no idea, if you figure that out go collect your Nobel prize.
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