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Optical image of the Milky Way (360 degrees)

Optical image of the Milky Way (360 degrees). Kapteyn (1922). Shapley (1919). COBE near-infrared image of the Milky Way. NGC 891. Magellanic clouds. Fornax dwarf galaxy. Leo I dwarf galaxy. M31 = Andromeda galaxy + NGC 205 + M32 (+ Moon, for scale).

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Optical image of the Milky Way (360 degrees)

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  1. Optical image of the Milky Way (360 degrees)

  2. Kapteyn (1922)

  3. Shapley (1919)

  4. COBE near-infrared image of the Milky Way

  5. NGC 891

  6. Magellanic clouds

  7. Fornax dwarf galaxy

  8. Leo I dwarf galaxy

  9. M31 = Andromeda galaxy + NGC 205 + M32 (+ Moon, for scale)

  10. Center of the Milky Way in near-infrared 6 light-months = 4”

  11. Semimajor axis = 950 AU Pericenter = 120 AU

  12. Proper motion (angular speed) of Sgr A*

  13. Freeman (1970)

  14. Rogstad & Shostak (1972)

  15. Roberts & Rots (1973)

  16. Van Albada et al. (1985) why doesn’t “disk” plus “halo” add up to total?

  17. Kent (1987)

  18. Kent (1987)

  19. Hipparcos animation of 8X8 degree field over 1500 yr

  20. J H K

  21. Ten nearest stars Ten brightest stars

  22. SDSS galaxy counts Yasuda et al. (2001)

  23. Gamma-ray burst counts Fishman & Meegan (1995)

  24. Reid et al. (2002) red = no correction for binaries green = corrected for binaries purple = Wielen et al. (1983)

  25. The mass-luminosity relation for main-sequence stars (Reid et al. 2002) Sun

  26. Mass function in the solar neighborhood dN = ξ(m) d log m = n(m)dm dN  dm/m

  27. Initial mass function in the solar neighborhood dN = ξ(m) d log m = n(m)dm dN  dm/m2.35 (Salpeter)

  28. Schlegel, Finkbeiner & Davis (1998)

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