Planets

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Across
  1. 2. Natural satellite of a planet
  2. 4. Force that keeps planets in orbit
  3. 5. The Red Planet
  4. 8. Closest planet to the Sun
  5. 11. Farthest planet from the Sun
  6. 13. Layer of gases surrounding a planet
  7. 15. Planet famous for its rings
  8. 16. Bowl-shaped hole on a planet's surface
  9. 18. Rocky object orbiting the Sun
Down
  1. 1. Icy body that orbits the Sun
  2. 3. Planet that spins on its side
  3. 4. Massive system of stars and planets
  4. 6. Path a planet takes around the Sun
  5. 7. Largest planet in the solar system
  6. 9. Feature surrounding Saturn
  7. 10. Hottest planet in the solar system
  8. 12. Our home planet
  9. 14. Dwarf planet once called the ninth planet
  10. 15. Relating to the Sun
  11. 17. Imaginary line a planet spins around