What are we comparing the speeds of far away objects to in order to come up with a speed? Is there a point at which we reach the single thing all motion is compared to? Is that thing light?
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All measurement in determined by deciding something to be standing still. 80mph is compared to the road being still, but the earth is rotating compared to the sun, so 80mph in a car may be -17,000 mph compare to the space station. the sun moves through space at several millions’ mph.
The special about light speed is that no matter if you decide it is you who are standing still, and you measure the speed of light, or you think f the sun moving at millions of miles, the speed of light will remain 100% exactly the same.
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