Astronomy Introduction

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Across
  1. 3. Planets made of gas and ice
  2. 4. The study of space
  3. 5. Our solar system is part of the Milky Way ____
  4. 8. All space
  5. 10. Balanced center of mass
  6. 11. Scientist who discovered the elliptical orbit
  7. 14. Season when Earth tilts away from the Sun
  8. 15. Model where the Sun is the center
  9. 18. Our North Star in 26,000 years due to precession
  10. 19. Precession is the slight change in __
  11. 20. Model where the Earth is the center
  12. 21. An __ belt lies beteen Mars and Jupiter
Down
  1. 1. Our current North Star
  2. 2. Planets made of rock and metal
  3. 6. Season when Earth tilts toward the Sun
  4. 7. Planet closest to the Sun
  5. 9. Nutation occurs every 18.6 ____
  6. 12. Nutation is the _____ in the rotation of Earth
  7. 13. Our sun formed from a solar _____
  8. 16. Deviation from a circle; ellipticity
  9. 17. The oval shape of the planets orbit