Why Asteroids?

1. Asteroids the size of 2014 AA hit earth several times a year

2. Two times astronomers detected an asteroid before it hit earth's atmosphere.

3. A large rock that orbits the sun, usually found between the orbits of jupiter and mars.

4. dense nickel iron core

5. has an intermediate zone of cellular nickel- iron and silicate minerals

6. has an outer layer of silicate

7. When the asteroid hit on new years eve in 2014, it was estimated that it carried about 500 tons of TNT.

8. Catalina Sky Survey uses their telescopes to tell if an asteroid was going to hit, and how far it was.