8.4

Explain that gravitational force:

- Causes Moons to orbit planets, as planets has a larger mass than moons, planets have stronger gravitational pull and will attract moons so they orbit the planets.
- Causes the planets to orbit the Sun, as the Sun has a larger mass than planets, the Sun has stronger gravitational pull and will attract planets so they orbit the Sun.
- Causes artifical satellites to orbit the Earth, as the Eartth has a larger mass than artifical satellites, the Earth has more gravitational pull and will attract artifical satellites so they orbit the earth.
- Causes comets to orbit the Sun, as the Sun has a larger mass than comets, the Sun has stronger gravitational pull and will attract comets so they orbit the Earth.