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Irregulars

22. 12. 23. 1. 21. 11. 2. 13. 20. 10. 3. 24. 14. 4. 19. 9. 8. 18. 5. 15. 25. 6. 17. 7. 16. Types of Galaxies. Irregulars. Hubble’s “Tuning Fork” Diagram. Galaxies. are classified by their shape. are “islands of stars”; the largest single grouping of stars held

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Irregulars

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  1. 22 12 23 1 21 11 2 13 20 10 3 24 14 4 19 9 8 18 5 15 25 6 17 7 16

  2. Types of Galaxies Irregulars

  3. Hubble’s “Tuning Fork” Diagram

  4. Galaxies.... • are classified by their shape. • are “islands of stars”; the largest single grouping of stars held together by mutual gravitational attraction. • are grouped in “clusters” and “super clusters.” • have a “red shift.” • can collide to form odd shapes.

  5. The Milky Way Galaxy • Mapped with radio waves & infrared to determine the shape • Discovered 4 major and numerous minor “arms” by using H gas emission concentrations • Our Sun is ~ 26,000 ly from the center • Our Sun has orbited the MW about 20 times • 100,000 ly across • 2,000 ly “thick” at bulge; bulge is ~ 20,000 ly diameter

  6. The Milky Way Galaxy (cont.) • Part of a “poor” cluster called the “Local Group” • The Local Group has ~ 40 members • The Local Group is ~ 2 million ly across

  7. Galaxy clusters can be…. Poor • 100’s of members or Rich • 1000’s of members

  8. they can be…. Regular shaped • Distinctly spherical or lenticular • Many galaxies at the center or Irregularly shaped • Randomly scattered

  9. “Superclusters” 10,000,000,000,000,000 members

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