Milky Way Galaxy

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Across
  1. 3. our future galactic partner
  2. 6. the type of cloud that birthed the MW
  3. 8. ninety-five percent of the MW
  4. 11. band of stars in the MW
  5. 12. determined the Sun was not at the center of MW
  6. 14. object so dense light can not escape
  7. 17. a major arm of the MW
  8. 18. discovered the Milky Way galaxy
  9. 19. she found the blackhole at the center of the MW
  10. 20. used to first detect the core of the MW
Down
  1. 1. the blackhole at the center of the MW
  2. 2. the shape of the MW
  3. 4. the middle of the MW
  4. 5. spherical volume of the galaxy
  5. 7. the location of the sun in the MW
  6. 9. area close to the galactic plane
  7. 10. concentrated area of stars not in the disk
  8. 13. time to orbit the center of the MW
  9. 15. type of blackhole at the center of the MW
  10. 16. came up with the Laws of Planetary motion