Thank you so much for all the answers, they have all be so helpful. 🙂
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Real ELI5: Everyone, no matter how fast they are moving, sees light to travel at the same speed. The time dilation and all of that are necessary for the math to work, and are observable.
It has to do with the speed of light and special relativity. As you gain speed, you gain mass. When you gain mass, things that are not as massive as you look like they’re moving in slow motion. When you get very close to the speed of light, like 99% the speed of light, you gain so much mass that things not moving as fast as you look like they’re standing still.
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