What are asteroids?

Where do most orbit?

How were all bodies in space, including planets, formed?

What determines an objects gravitational force?

Asteroids have relatively low masses compared to the mass of which planet?

What does Jupiter's gravitational force do?

What do scientists believe out Moon was a result of?

What joined together to form our Moon?

What is the scientific evidence which supports this idea?

What geologists examine to support the theory that asteroids have collided with Earth?

Give three examples of this evidence which has been examined.

What type of orbit does a comet have?

Most comets pass inside the orbit of Mercury and well beyond the orbit of Pluto. What happens as the comet passes close to the Sun?

Scientists are constantly monitoring and plotting the paths of what?

What happens to the speed of a comet as is approaches the Sun and then gets further away?

Why does this happen?

If a NEO is on a collision course with Earth what could happen?

What would one option be to avoid this?