Space Words Puzzle

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Across
  1. 2. Initials of Optimists International.
  2. 4. First name of moon hero.
  3. 6. A sphere or globe
  4. 7. Same thing as stars.
  5. 9. Heavenly bodies
  6. 12. Initials of Underwater Battery.
  7. 13. What makes a rocket go.
  8. 15. I went ___ the store.
Down
  1. 1. Opposite of "yes."
  2. 3. Opposite of "out."
  3. 5. Chores.
  4. 8. One of the planets.
  5. 10. Do, re, mi, fa, so, ___, ti, do.
  6. 11. Abbrev. for East Indies
  7. 13. Number of planets in the solar system.
  8. 14. Abbrev. for "no good."