Best explanation I can give, it takes more energy and force to move something bigger so even if something is going fast and its large it still looks slow. Look at the earth, Iirc its spinning at like 1000 mph but since it’s so large it takes 24 hours to rotate. Something with a smaller mass would be going faster if it were going that fast so its seen as moving faster. I’m sure I’m missing things like restiance and gravity but that’s just how I understand it
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