Optical image of the Milky Way (360 degrees)
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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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Optical image of the milky way 360 degrees

Optical image of the Milky Way (360 degrees)


Optical image of the milky way 360 degrees

Kapteyn (1922)


Optical image of the milky way 360 degrees

Shapley (1919)


Optical image of the milky way 360 degrees

COBE near-infrared image of the Milky Way


Optical image of the milky way 360 degrees

NGC 891


Optical image of the milky way 360 degrees

Magellanic clouds


Optical image of the milky way 360 degrees

Fornax dwarf galaxy


Optical image of the milky way 360 degrees

Leo I dwarf galaxy


Optical image of the milky way 360 degrees

M31 =

Andromeda galaxy

+ NGC 205 + M32

(+ Moon, for scale)


Optical image of the milky way 360 degrees

Center of the Milky Way in near-infrared

6 light-months = 4”


Optical image of the milky way 360 degrees

Semimajor axis = 950 AU

Pericenter = 120 AU


Optical image of the milky way 360 degrees

Proper motion (angular speed) of Sgr A*


Optical image of the milky way 360 degrees

Freeman (1970)


Optical image of the milky way 360 degrees

Rogstad & Shostak (1972)


Optical image of the milky way 360 degrees

Roberts & Rots (1973)


Optical image of the milky way 360 degrees

Van Albada et al. (1985)

why doesn’t “disk” plus “halo” add up to total?


Optical image of the milky way 360 degrees

Kent (1987)


Optical image of the milky way 360 degrees

Kent (1987)


Optical image of the milky way 360 degrees

Hipparcos animation of 8X8 degree field over 1500 yr


Optical image of the milky way 360 degrees

J H K


Optical image of the milky way 360 degrees

Ten nearest stars Ten brightest stars


Optical image of the milky way 360 degrees

SDSS galaxy counts

Yasuda et al. (2001)


Optical image of the milky way 360 degrees

Gamma-ray burst counts

Fishman & Meegan (1995)


Optical image of the milky way 360 degrees

Reid et al. (2002)

red = no correction for binaries

green = corrected for binaries

purple = Wielen et al. (1983)


Optical image of the milky way 360 degrees

The mass-luminosity relation for main-sequence stars

(Reid et al. 2002)

Sun


Optical image of the milky way 360 degrees

Mass function in the solar neighborhood

dN = ξ(m) d log m = n(m)dm

dN  dm/m


Optical image of the milky way 360 degrees

Initial mass function in the solar neighborhood

dN = ξ(m) d log m = n(m)dm

dN  dm/m2.35 (Salpeter)


Optical image of the milky way 360 degrees

Schlegel, Finkbeiner & Davis (1998)


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