Across
- 2. wrote three laws of planetary motion; identified elliptical orbits (564)
- 5. theory stating Earth is center of solar system (561)
- 8. Pluto is considered a __ planet (567)
- 10. __ motion describes appearance of stars moving away or backing up (562)
- 12. __ planets have solid, rocky surfaces (569)
- 14. when a planet is closest to the sun (566)
- 15. studies four moons of Jupiter w/ telescope (564)
- 16. theorized planets move in epicycles (562)
- 17. large bodies in space that have their own gravity and revolve around sun (561)
- 18. largest volcano in our solar system (on Mars) (573)
Down
- 1. theory stating sun is the center of our solar system (563)
- 3. Pluto and many asteroids are in the __ belt beyond Neptune (560)
- 4. __ planets are gaseous (569)
- 6. "dirty snowball"
- 7. built precise instruments to observe sky (564)
- 9. a natural satellite (567)
- 11. shpae of each planet's orbit (565)
- 13. when a planet is farthest from sun (566)
- 14. a name of one of Mars' moons (573)