Summary:
- All objects in the universe have an attraction to each other.
- This attraction is known as gravity.
- The strength of the force of gravity depends on two things.
- One is the mass of the objects; the other is the distance between the objects.
- Gravity is also the force that keeps the Moon circling Earth.
- Without gravity, these objects would fly off into space (Figure below).
- The Moon orbits the Earth, and the Earth-Moon system orbits the Sun.
- Gravity holds our planet together.
- We wouldn't be here without gravity.