STEMscopedia crossword

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Across
  1. 2. water covering three-quarters of its surface and its one moon
  2. 5. gas giant
  3. 6. no longer a major planet
  4. 8. named for the swift message of the gods
  5. 9. our solar system sits inside one of the spiral arms of the _____ _____
  6. 12. Within our solar system are _______ major planets grouped by proximity to the sun
  7. 15. means to rotate backwards
  8. 17. known for having the largest ring system
  9. 18. called the red planet, due to iron oxide (rust) in the soil
  10. 19. has 63 moons and counting
Down
  1. 1. rocky objects that orbit the sun
  2. 3. large space rocks between Mars and Jupiter
  3. 4. Roman god of the sea
  4. 7. accurate view of space from Earth
  5. 8. about 180 discovered ____ orbit the planets of our solar system
  6. 10. small mass of dust and ice that originates in an area beyond Pluto called the Oort Cloud
  7. 11. remain stationary
  8. 13. survives its passage through the atmosphere and strikes Earth's surface
  9. 14. covered in a thick atmosphere of carbon dioxide
  10. 16. diameter is more than 100 times greater than Earth's