into the unknown quest

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Across
  1. 3. first name of second man on moon
  2. 4. first name of first man on moon
  3. 5. first name of first woman in space
  4. 6. first letter of all the planets in order
  5. 8. first name of first man in space
  6. 9. 4th planet
Down
  1. 1. biggest planet
  2. 2. first name of first woman on moon
  3. 5. hottest planet
  4. 7. the sun is a ____