Out of this World

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Across
  1. 2. Largest planet
  2. 5. An object that orbits another
  3. 6. Number of moons orbiting Mars
  4. 10. Russian term for astronaut
  5. 13. NASA program that landed a man on the moon
  6. 14. First to walk on the moon
  7. 16. Star explosion
Down
  1. 1. First U.S.-crewed NASA program
  2. 2. Cartoon space family from the 60's
  3. 3. Is it or isn't it a planet?
  4. 4. Visitor from outer space
  5. 7. The sun is one
  6. 8. A collection of billions of stars
  7. 9. The study of stars
  8. 10. Space rock with a tail
  9. 11. Path of a planet or spacecraft
  10. 12. Planet between Mercury and Earth
  11. 15. Our galaxy
  12. 17. Constellation with a "belt"