Physics P2 - Threats to earth

The Moon may be the remains of a planet that collided with the Earth during the early years of the Earth’s existence. Asteroids are rocks in space, while comets are balls of dust and ice in space. There would be serious consequences if a large asteroid collided with the Earth.

Evidence for collision

Here is some evidence for the collision theory.

• The Earth has a relatively large iron core but the Moon has a much smaller one.
• Moon rocks…