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en.wikipedia.org/wiki/Spiral_galaxy

Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae and, as such, form part of the Hubble ...

cas.sdss.org/dr6/en/proj/basic/galaxies/spirals.asp

The most common type of galaxy is called a "spiral galaxy." Not surprisingly, spiral galaxies look like spirals, with long arms winding toward a bright bulge at the ...

www.nasa.gov/multimedia/imagegallery/image_feature_2132.html

Resembling festive lights on a holiday wreath, this NASA/ESA Hubble Space Telescope image of the nearby spiral galaxy M74 is an iconic reminder of the ...

www.space.com/22382-spiral-galaxy.html

Aug 15, 2013 ... A spiral galaxy has a distinct winding shape. Most of the galaxies observed by astronomers are spiral galaxies.

coolcosmos.ipac.caltech.edu/ask/217-What-is-a-spiral-galaxy-

Spiral galaxies get their name from the shape of their disks. In a spiral galaxy, the stars, gas and dust are gathered in spiral arms that spread outward from the ...

gtn.sonoma.edu/resources/normal_galaxies/spiral.php

Possibly related to the "luminosity class" for galaxies is the fact that some galaxies have well defined arms, while other spirals have poorly defined or even  ...

www.astro.cornell.edu/academics/courses/astro201/galaxies/types.htm

Apr 18, 2000 ... There are three main types of galaxies: Elliptical, Spiral, and Irregular. Two of these three types are further divided and classified into a system ...

astronomy.swin.edu.au/cosmos/S/Spiral+Galaxy

When Hubble developed his classification system for galaxies based on their appearance in optical light, he divided the spirals into those in which the spiral arm ...

hubblesite.org/news_release/news/2017-14

Apr 20, 2017 ... Hubble Celebrates Its Anniversary with a Spectacular Pair of Galaxies. When the Hubble Space Telescope launched aboard the Space Shuttle ...

www.windows2universe.org/the_universe/Spirals.html

Spiral galaxies may remind you of a pinwheel. They are rotating disks of mostly hydrogen gas, dust and stars. Through a telescope or binoculars, the bright ...