1. According to the "Big Bang" theory, the universe is about 10 million years old.

2. The world’s largest meteorite fell on England.

3. There are four parts to a comet: the head, body, arms, and tail.

4. Comets are largely composed of ice.

5. Most meteorites that strike Earth are unrecorded.

6. Asteroids were discovered as early as the 19th century.