Earth Science Unit 9 Lesson 1

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Across
  1. 2. Added epicycles to explain retrograde planetary motion
  2. 7. Proposed early model with nonmoving stationary Earth
  3. 10. Inner rocky planets like Mercury and Earth
  4. 13. Planet passing in front of another body
  5. 14. Earth centered model of the universe
  6. 15. Apparent shift in position of an object
  7. 16. Discovered four moons orbiting around Jupiter in 1609
  8. 17. Chunks of ice and dust orbiting sun
  9. 19. Space debris burning in Earth's atmosphere
  10. 20. Proposed early model placing sun at the center
  11. 22. Calculated elliptical planetary orbits using Brahe's observations
Down
  1. 1. Largest planet in our solar system array
  2. 3. Oval-shaped paths followed by planets in orbit
  3. 4. Apparent backward looping motion of a planet
  4. 5. Sun-centered model proposed by Copernicus in 1543
  5. 6. Force holding objects in their orbital paths
  6. 8. Center object held by gravity pulling planets
  7. 9. Small circular paths added to planetary orbits
  8. 11. First identified asteroid belt object now dwarf planet
  9. 12. Rocky or metallic space debris throughout space
  10. 15. Reclassified as dwarf planet due to shared orbit
  11. 18. Instrument collecting light to magnify distant objects
  12. 21. Eight major celestial bodies orbiting the sun