SOLAR SYSTEM

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Across
  1. 3. Oval shaped with two points
  2. 4. Red planet
  3. 6. Elliot Scientist who studied the uranian atmosphere
  4. 9. Small robot used to explore the Martian landscape
  5. 10. Essential to living things
  6. 11. Mars belongs to this group
  7. 12. Blue planet
  8. 15. Largest moon
  9. 17. Backward rotation
  10. 21. Mass of swirling storm of clouds
  11. 22. Comes from decaying plants and animals, as well as, from volcanic eruptions
  12. 23. Cloudlike mass that surrounds the nucleus
  13. 24. Newton English mathematician and physicist
  14. 25. Small fragments and dust
  15. 27. Shooting stars
  16. 29. Beautiful planet with its system of rings
  17. 30. Evening and morning star
Down
  1. 1. Smaller moon
  2. 2. Robotic spacecraft sent by NASA to orbit the planet Mercury
  3. 5. Orbits the sun but too small to be considered planets
  4. 7. Landed on Mars on July 4, 1997
  5. 8. Fastest planet
  6. 12. Venus
  7. 13. Another term for the four moons
  8. 14. Thick clouds that surround planet Venus
  9. 16. Greek term for comet
  10. 18. Largest planet
  11. 19. Moves in elliptical orbit around the sun
  12. 20. Planets that are much bigger but less dense than the rocky planets
  13. 23. Formed from some materials left from the formation of the planets
  14. 26. Star at the center of the solar system
  15. 28. One possible mission to Mars