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 is not about light. Light just happened to be something that we discovered traveled at this speed so we called it the speed of light. Light can actually move slower than the ‘speed of light.’ This is why this term can be confusing. The real way to look at this, it is the speed of causality. The speed at which information can propagate and information can only travel at 3.0*10^8 meters/s. Sun disappears, it will take 8 minutes for gravity and illumination to change on Earth. So we will keep revolving around the non-existent Sun and see non-existent light because that information hasn’t reach Earth yet.
The speed of causality works on the Pythagorean theorem. A^2+B^2=C^2. Our location in space is a dimension, our location in time is a dimension. If you are perfectly still, you are then moving through time as max velocity, but as soon as you begin to move, your passage through time changes. Back to Pythag. A, your velocity in space, B your velocity in time, and A^2+B^2=C^2 where C is the speed of light/causality. The faster you move through space, the slow you move through time, so if you happen to be moving at 99% the speed of light/causality, any information you are giving to others is flying away from them rapidly and as a result, the information is stretched out so they see you moving through time slower. Like a doppler effect, but for cause and effect.
This is why many scientists say FTL travel is impossible. It would require time to move backwards. That you experience an effect you caused, before you caused it, i.e. A^2+B^2=C^2 but A > C, then B^2 needs to be a negative number, so now B must be an imaginary number so its square becomes negative and this is why the whole FTL concept breaks down.
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