solar system

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Across
  1. 3. Planet tilted on its side
  2. 8. Centre of our solar system
  3. 9. Only planet with liquid water, oxygen and living organisms
  4. 11. Instrument used to observe space
  5. 12. Surface of the Earth is covered by land masses and ___________.
  6. 13. The sun is made up of helium and _________.
  7. 17. Largest moon in the solar system
  8. 19. Earth's sister planet
  9. 20. Recently demoted to a dwarf planet
Down
  1. 1. Large planet with magnificent ring
  2. 2. Number of planets in our solar system
  3. 4. Between Mars and Jupiter is a band of rock called __________.
  4. 5. Largest planet in solar system
  5. 6. Gas responsible for colour of Neptune
  6. 7. Metal responsible for colour of Mars
  7. 10. Name of our galaxy
  8. 14. Force that keeps objects grounded
  9. 15. Planet most similar to Earth
  10. 16. Smallest and closest planet to sun
  11. 18. Four moons of Jupiter are: Callisto, IO, Ganymede, and _________.