stevenp6 wrote:Yes a fixed orbit means it is whizzing around the Earth. Centrifugal forces don't come into it - just speed and gravity. Did you go to school?
Centrifugal force does not come into it, i.e. the fixed orbit around Earth? Only Earth gravity acts on Hubble in fixed orbit! But then it would drop down to Earth at once! Or does Hubble speed away to avoid gravity?
What did you learn at school? Gardening? Cooking? Did you pass?