It’s called parallax. You’ve seen this before as a passenger on ground transports too. You’re going 70+ miles per hour and the world near you zooms by, but those mountains or that radio tower in the distance just crawl on by. Now imagine you’re not just a few miles away from the mountains but the entire surface of the earth with nothing really nearby to zoom past. All you have are the slowly crawling landscapes beneath you. It makes it seem like you’re not moving very fast. But if you were to see a plane passing within a few hundred feet of you going the opposite direction, you’d notice you’re going blazingly fast.
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