Chapter 23 Crossword

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