spaced out

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Across
  1. 3. the oldest star
  2. 6. the only planet with known life on it
  3. 8. saturn's smallest moon
  4. 9. the planet behind earth
  5. 10. the planet In front of earth
  6. 12. the biggest star
  7. 13. the smallest star
  8. 15. nickname for the earth
Down
  1. 1. the rover that collected data, including photographs, as it rolled over the Martian surface in 2012.
  2. 2. a planet with rings
  3. 4. the planet closest to the sun
  4. 5. the probe that has been orbiting Mercury since March 2011
  5. 7. the planet farthest away from the sun]
  6. 11. Saturn's biggest moon
  7. 14. the biggest star in our solar system