Optical image of the Milky Way 360 degrees

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Optical image of the Milky Way (360 degrees)
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Kapteyn (1922)
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Shapley (1919)
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COBE near-infrared image of the Milky Way
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NGC 891
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Magellanic clouds
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Fornax dwarf galaxy
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Leo I dwarf galaxy
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M31 Andromeda galaxy NGC 205 M32 ( Moon,
for scale)
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Center of the Milky Way in near-infrared 6
light-months 4
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Semimajor axis 950 AU Pericenter 120 AU
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Proper motion (angular speed) of Sgr A
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Freeman (1970)
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Rogstad Shostak (1972)
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Roberts Rots (1973)
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Van Albada et al. (1985)
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Kent (1987)
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Kent (1987)
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Hipparcos animation of 8X8 degree field over 1500
yr
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Distance to Hyades cluster 46.3 0.3 pc
(Perryman et al. 1998)
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J H K
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Ten nearest stars
Ten brightest stars

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SDSS galaxy counts Yasuda et al. (2001)
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Gamma-ray burst counts Fishman Meegan (1995)
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Reid et al. (2002) red no correction for
binaries green corrected for binaries purple
Wielen et al. (1983)
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The mass-luminosity relation for main-sequence
stars (Reid et al. 2002)
Sun
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Mass function in the solar neighborhood dN ?(m)
d log m n(m)dm
dN ? dm/m
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Initial mass function in the solar
neighborhood dN ?(m) d log m n(m)dm
dN ? dm/m2.35 (Salpeter)
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Cappellari et al. (2005)
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Schlegel, Finkbeiner Davis (1998)