Spiral galaxy

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An example of a spiral galaxy, the Pinwheel Galaxy (also known as Messier 101 or NGC 5457)

A spiral galaxy is a certain kind of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae and, as such, forms part of the Hubble sequence. Spiral galaxies consist of a flat, rotating disk containing stars, gas and dust, and a central concentration of stars known as the bulge. These are surrounded by a much fainter halo of stars, many of which reside in globular clusters.

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Spiral Galaxies @ SEDS Messier pages Spiral Galaxies @ SEDS Messier pages www.seds.org/messier/spir.html - Web

SpiralZoom.com SpiralZoom.com spiralzoom.com/Science/spiralgalaxies/SpiralGalaxies.html - Web

Spiral Structure explained Spiral Structure explained burro.cwru.edu/Academics/Astr222/Galaxies/Spiral/spiral.html - Web

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GLIMPSE: the Galactic Legacy Infrared Mid-Plane Su... GLIMPSE: the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire www.astro.wisc.edu/sirtf/ - Web

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