why does the iss move through the sky really quickly yet planets further out barely seem to move?
In: Physics
Take your finger and move it at a slow speed like 2 inches in front of your eye. Then take your finger and move it at the same speed as far away from your body as it can reach.
The closer objects are to you, the faster they move across your field of vision. The same principle applies here. The ISS is 254 miles above you. The closest Mars ever comes to earth is 33.9 MILLION miles. That’s the difference between your finger an inch from your eye and your finger being 2.1 miles away.
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