Star Gazing

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Across
  1. 3. German founder of celestial mechanics
  2. 5. "That star has gone super____!"
  3. 7. The solar system's most famous telescope
  4. 9. Proved the Sun is at the center of the solar system
  5. 12. System of dust, gas, and billions of stars
  6. 13. Group of stars that form a pattern
  7. 14. Small body of matter from outer space that enters the Earth's atmosphere
  8. 16. The most abundant element in the universe
  9. 18. The nearest neighbor to the Milky Way
  10. 19. Cosmic snowballs with long tails
Down
  1. 1. Cloud-like version of 12 Across
  2. 2. A type of 12 Across with multiple arms
  3. 4. "My ______ sign is Aquarius"
  4. 6. Formed by collision of galaxies
  5. 8. Unit of astronomical distance
  6. 10. Small, old, relatively cool star
  7. 11. The galaxy in which we live
  8. 15. Saturn has these
  9. 17. Point where a celestial body is directly above