Sebastian's super space crossword

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Across
  1. 3. heats our planet
  2. 4. 2nd planet closest to the sun
  3. 5. the 8th planet in our solar system
  4. 8. said "one small step for man,one giant leap for mankind"
  5. 10. the smallest planet in our solar system
Down
  1. 1. a ringed planet
  2. 2. this planet has 79 moons
  3. 6. our planet
  4. 7. the coldest planet in our solar system
  5. 9. also known as the red planet
  6. 10. Armstrong was the first to step on the it