Solar System Crossword

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Across
  1. 2. when the northern hemisphere is tilted toward the sun, it is this season in North America
  2. 4. gas that gives Neptune and Uranus their blue-green color
  3. 6. Earth's spinning on its axis that causes day and night
  4. 7. shape of Earth's orbit
  5. 9. planet that rotates on its side
  6. 11. sometimes called Earth's twin
  7. 15. often called the red planet
  8. 16. planet with an orbit that intersects the orbit of the dwarf planet Pluto
  9. 17. length of time for Earth to orbit the sun once
  10. 18. planet with little or no atmosphere because the solar winds blow it away
  11. 20. an orbit around the sun
  12. 21. all outer planets are composed mainly of this type of matter
  13. 22. number of moons orbiting Mercury and Venus
  14. 23. when the northern hemisphere is tilted away from the sun, it is this season in North America
  15. 24. space object that was reclassified as a dwarf planet in 2006
Down
  1. 1. largest planet in the solar system
  2. 3. this planet has the largest volcano in the solar system, Olympus Mons
  3. 5. length of time for Earth to spin on its axis once
  4. 7. planet with an atmosphere that consists mainly of nitrogen and oxygen
  5. 8. name of Earth's moon
  6. 10. planet with the largest ring system
  7. 12. where many asteroids are found; separates the inner and out planets
  8. 13. contains over 99% of the mass of the solar system
  9. 14. huge storm on Jupiter
  10. 19. a natural satellite