1.33 explain that gravitational force:  causes moons to orbit planets  causes the planets to orbit the sun  causes artificial satellites to orbit the Earth  causes comets to orbit the sun

if an object entres the field of another objects gravitational force, it will travel around the object in an orbit.

This causes...
- planets to orbit the sun
- artificial satellites to orbit earth
- comets to orbit the sun
- moons to orbit planets