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spi·ral gal·ax·y

noun

noun: spiral galaxy; plural noun: spiral galaxies

1. a galaxy in which the stars and gas clouds are concentrated mainly in one or more spiral arms.

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Spiral galaxy - Wikipedia, the free encyclopedia

https://en.wikipedia.org/wiki/Spiral_galaxy

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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 disc containing stars, gas and dust, and a central concentration of stars known as the bulge.

‎Barred spiral galaxy · ‎Sunflower Galaxy · ‎Grand design · ‎Flocculent

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More images for spiral galaxy

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Spiral Galaxies - SDSS

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

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The arms of a spiral galaxy have lots of gas and dust, and they are often areas where new stars are constantly forming. The bulge of a spiral galaxy is composed primarily of old, red stars. Very little star formation goes on in the bulge.

Spiral Galaxy Facts & Definition - Space.com

www.space.com › Science & Astronomy

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Aug 15, 2013 - This Hubble Space Telescope photo of Messier 74 reminds us that spiral galaxies are some of the most beautiful and photogenic residents of the universe. ... Most of the galaxies in the universe observed by scientists are spiral galaxies. ... Most spiral galaxies contain a central bulge ...