What is the centripetal force?

What happens to the gravitational force between two objects as you move them further apart?

What are the two type of orbits an artificial satellite can be in and what is each used for?

What is the inverse square law?

What type of loop does a:
1) Planet have
2) Comet have

What happens when a comet is close to the sun and what happens when it is far away and why?

Why is a geostationary satellite travel much more slowly than a low polar orbit satellite?