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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The speed of light (causality) is the same for all reference frames. Regardless of how fast or slow we’re traveling compared to other things with mass, we all experience light moving at the same speed.
‘Length conraction’ and ‘ time dilation’ are observations from a frame of reference that can be stationary. At the speed of light in a vacuum the space shortens to zero and time stops. Not because the distance and time are zero, but because as a result of the ‘zero’ there is no valid reference frames.
Time is a side effect of moving slower than the speed of light. In 4D spacetime, everything moves at the same rate. Only so much of that can translate into motion in 3D space + time when mass is added.
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