Across
- 2. a large, round object that revolves around a star and has cleared the region around its orbit
- 6. an explosive eruption of waves and particles from the sun into space
- 7. the four closest planets to the sun - Mercury, Venus, Earth, and Mars
- 8. the path an object takes as it revolves around a star, planet, or moon
- 12. one full orbit around the sun
- 13. a gigantic sphere made of very hot gas
- 14. has the same characteristics as a planet, but has NOT cleared the region around its orbit (Pluto is one)
Down
- 1. the gas giants - Jupiter, Saturn, Uranus, Neptune
- 3. a piece of rock that enters the earth's atmosphere and burns, appearing as a streak of light.
- 4. a spacecraft that gathers data without a crew
- 5. a natural object that revolves around a planet
- 9. a rocky mass up to several hundred kilometers wide that revolves around the sun
- 10. a frozen mass of different types of ice and dust orbiting the sun
- 11. a group of stars that forms a pattern
- 12. one whole spin of an object on its axis
- 15. an imaginary line around which an object spins