Everything is miles and miles away. Thank a commercial aircraft flying between 460 – 575 mph airspeed through the air because of the distance from the viewer who is stood on the earth the aircraft would look slower due to the lack of reference points up in the atmosphere. Being an airspeed of 500 mph in the air would equate to a ground speed of around just 400 mph due to the curvature of the earth so there are more miles between point to point the higher up you go.
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