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Across
  1. 3. Unseen mass in the universe
  2. 6. Space with no matter
  3. 8. Brightest star in the night sky
  4. 11. Recognizable star pattern
  5. 13. Force driving universe expansion
  6. 15. Galaxy with an oval shape
  7. 17. Decrease in wavelength
  8. 21. Closest large galaxy to us
  9. 23. W-shaped constellation
  10. 24. Prominent constellation
  11. 25. Great Bear constellation
Down
  1. 1. Red supergiant star
  2. 2. North Star
  3. 4. Group of galaxies
  4. 5. Band of constellations
  5. 7. Pattern of stars in sky
  6. 9. Type of galaxy with arms
  7. 10. Apparent shift in position
  8. 12. Our galaxy
  9. 14. Increase in wavelength
  10. 16. Theory of universe's origin
  11. 18. Little Bear constellation
  12. 19. Star system with two stars
  13. 20. Related to the universe
  14. 22. Universe growing over time