Something that’s really far away but moving quickly is easy to mistake for something that’s closer and moving slowly.
It’s similar to how a plane in the sky doesn’t look like it’s moving very fast because there’s nothing nearby that you can compare it with to get a sense for how far away it is.
Rockets are not a thing that most of us have seen in person, so we don’t have a good sense for how big they are. You’re probably thinking they’re smaller than they really are, which makes it look like they’re moving more slowly than they really are.
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