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Galaxies

Galaxies. What Are Galaxies?. Greek galax = milk William Herschel, 1783: A disk with the Sun slightly off-center. What Are Galaxies?. 19th Century: “Spiral Nebulae” Nearby? Maybe Solar Systems in Formation? 1920: Galaxies are Stars 1920’s: Galaxies are like the Milky Way

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Galaxies

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  1. Galaxies

  2. What Are Galaxies? • Greek galax = milk • William Herschel, 1783: A disk with the Sun slightly off-center

  3. What Are Galaxies? • 19th Century: “Spiral Nebulae” • Nearby? Maybe Solar Systems in Formation? • 1920: Galaxies are Stars • 1920’s: Galaxies are like the Milky Way • Biggest single increase in our mental picture of the Universe in human history

  4. Where Are We in our Galaxy? • The visible Milky Way suggests our galaxy is a flat disk • Surrounding other galaxies is a spherical halo of Globular Star Clusters

  5. Galaxies and Globular Clusters

  6. The Milky Way’s Globular Clusters

  7. The Milky Way As We See It

  8. The Visual Milky Way

  9. Anatomy of a Galaxy

  10. Spiral Arms

  11. In Microwaves, We Can See the Hub of the Galaxy

  12. Center of the Milky Way

  13. The Galaxy

  14. Mapping the Neighborhood

  15. Mapping the Neighborhood

  16. Mapping the Galaxy: Not There Yet

  17. Mapping the Galaxy: Not There Yet

  18. Hubble’s Classification of Galaxies

  19. Elliptical Galaxy (M87)

  20. S0/Sa Galaxy

  21. Barred S0 Galaxy

  22. Sa Galaxy (Seyfert)

  23. Sb Galaxy (M81)

  24. M81 in Ultraviolet

  25. Sc Galaxy

  26. Sc Galaxy

  27. Sc Galaxy (M51)

  28. Sba Galaxy

  29. SBb Galaxy

  30. SBc Galaxy

  31. Density Waves

  32. Rotation of the Milky Way

  33. Ring Galaxy

  34. Ring Galaxy

  35. The Local Group

  36. Downtown: The Virgo Cluster: 50 m.l.y

  37. The Local Super-cluster

  38. The Coma Cluster350 m.l.y.

  39. Large-Scale Structure of the Universe to 500 m.l.y.

  40. Large-Scale Structure of the Universe

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