Pictures and Sentences

1.comet: The astronomers discover several long period comets every year.

2. meteoroid: Some of those pieces, called meteoroids, can get close to the Earth and be pulled toward the Earth by its gravity.

3. meteor: The British Association for the Advancement of Science, founded in 1830, included meteorology among the sciences which it intended to advance.

4. meteorite: Most meteorites are thought to come from asteroids, small rocky bodies orbiting the Sun.