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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.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.

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 ...

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 ...

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

Since our own galaxy is a spiral, most of our understanding of spiral galaxy formation comes from studies of the stellar populations within the Milky Way.

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

Dec 16, 2011 ... Resembling festive lights on a holiday wreath, this NASA/ESA Hubble Space Telescope image of the nearby spiral galaxy M74 is an iconic ...

www.britannica.com/science/spiral-galaxy

Other articles where Spiral galaxy is discussed: galaxy: Spiral galaxies: Spirals are characterized by circular symmetry, a bright nucleus surrounded by a thin ...

study.com/academy/lesson/spiral-galaxy-definition-facts-quiz.html

Spiral galaxies are one of the classifications of galaxies designated by the Hubble Classification System. Our own galaxy, the Milky Way, is...