spiral arm of a galaxy

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• spiral arm — Astron. any of the elongated and curved spiral sections that are connected to the center of a spiral galaxy. [1910 15] * * * spiral arm noun An arm of a spiral galaxy • • • Main Entry: ↑spire …   Useful english dictionary

• spiral arm — Astron. any of the elongated and curved spiral sections that are connected to the center of a spiral galaxy. [1910 15] * * * …   Universalium

• spiral arm — noun A section of a spiral galaxy that coils out from the centre …   Wiktionary

• Galaxy groups and clusters — are the largest known gravitationally bound objects to have arisen thus far in the process of cosmic structure formation.[1] They form the densest part of the large scale structure of the universe. In models for the gravitational formation of… …   Wikipedia

• Galaxy — This article is about the astronomical structure. For other uses, see Galaxy (disambiguation). NGC 4414, a typical spiral galaxy in the constellation Coma Berenices, is about 55,000 light years in diameter and approximately 60 million light… …   Wikipedia

• Galaxy morphological classification — Artist s concept illustrating bulge no bulge spiral galaxies. Galaxy morphological classification is a system used by astronomers to divide galaxies into groups based on their visual appearance. There are several schemes in use by which galaxies… …   Wikipedia

• Places in The Hitchhiker's Guide to the Galaxy — Hitchhiker s portal This is a list of places featured in Douglas Adams s science fiction series, The Hitchhiker s Guide to the Galaxy. The series is set in a fictionalised version of the Milky Way galaxy and thus, while most locations are pure… …   Wikipedia

• galaxy — /gal euhk see/, n., pl. galaxies. 1. Astron. a. a large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space. b. (usually cap.) See Milky Way. 2. any large and brilliant or impressive… …   Universalium

• Spiral galaxy — A spiral galaxy is a galaxy belonging to one of the three main classes of galaxy originally described by Edwin Hubble in his 1936 work “The Realm of the Nebulae” [cite book |last=Hubble |first=E. P. |authorlink=Edwin Hubble |title=The Realm of… …   Wikipedia

• Milky Way Galaxy — Large spiral galaxy (roughly 150,000 light years in diameter) that contains Earth s solar system. It includes the multitude of stars whose light is seen as the Milky Way, the irregular luminous band that encircles the sky defining the plane of… …   Universalium

• Triangulum Galaxy — Messier 33 Observation data (J2000 epoch) Pronunciation /traɪˈæŋɡjʉləm/ …   Wikipedia