Across
- 4. a comet with a period shorter than 200 years
- 6. a meteoroid that enters the earth's atmosphere
- 8. asteroid groups that travel on either side pf Jupiter
- 12. a large ring of asteroids located between the orbits of Mars and Jupiter
- 13. a highly reflective streamer emitted from a comet
- 14. small chunks of rock or metal in space that are usually smaller than asteroids
- 15. the heart of a comet; 2/3 ice and 1/3 dust
- 16. an asteroid-sized object that is made of rock and frozen materials
Down
- 1. a comet with a period of more than 200 years
- 2. a group of asteroids that travel relatively close to the earth
- 3. meteors that land on the earth's surface
- 5. a "new planet" that led to the discovery of asteroids
- 7. a comet belt; several dwarf planets are considered a part of this
- 9. correctly calculated the orbit of a comet that was named in his honor
- 10. gas and dust that form a cloud around the heart of a comet
- 11. this happens when the earth passes through a meteor stream (the trail that an orbiting comet leaves behind it)