Galaxy Crossword Puzzle

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Across
  1. 2. dwarf,
  2. 4. interstellar medium,
  3. 6. telescope,
  4. 7. darkmatter,
  5. 9. Andromeda,
  6. 15. astronomer,
  7. 16. T-Tauri,
  8. 17. galaxies,
Down
  1. 1. spiral,
  2. 3. stars,
  3. 5. spiral arms,
  4. 8. Orion arm,
  5. 10. light,
  6. 11. Milky Way,
  7. 12. clouds,
  8. 13. universe,
  9. 14. system, big bang,