Astronomy Scavenger Hunt: Who Am I?

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Across
  1. 2. I published the first moon map (Thomas)
  2. 3. I believed that the Earth was the center of the universe
  3. 5. I discovered Hyperion, one of Saturn's moons, along with my brother, George
  4. 7. I study black holes and the subatomic particles that radiate from them
  5. 8. I discovered Titan, the largest moon of Saturn
  6. 10. I made the first catalogue of stars and the first map of the skies
  7. 11. I discovered that 4 moons of Saturn (Giovanni)
  8. 12. I discovered the 2 moons of Mars - Phobos and Deimos
  9. 14. I showed that other galaxies existed and that the universe is expanding
  10. 15. I named the stars by assigning them to constellations and giving them Greek letters
  11. 16. I discovered Triton, the largest moon of Neptune
  12. 19. I realized that the planets go around the Sun
Down
  1. 1. I developed the Big Bang theory
  2. 4. I discovered Pluto
  3. 6. I discovered the first and largest asteroid
  4. 7. I discovered the planet, Uranus
  5. 9. I discovered the 4 moons of Jupiter
  6. 10. I predicted the return of a comet that was eventually named after me
  7. 12. Russell and I discovered the relationship between a star's temperature and brightness
  8. 13. I discovered Neptune with John Couch Adam
  9. 17. I made a list of comets in the 1700's
  10. 18. My theory of the universe was held as law for thousands of years, even though it was wrong