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- Spiral_galaxy abstract "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.Spiral galaxies are named for the spiral structures that extend from the center into the disk. The spiral arms are sites of ongoing star formation and are brighter than the surrounding disk because of the young, hot OB stars that inhabit them.Roughly two-thirds of all spirals are observed to have an additional component in the form of a bar-like structure, extending from the central bulge, at the ends of which the spiral arms begin. The proportion of barred spirals relative to their barless cousins has changed over the history of the Universe, with only about 10% containing bars about 8 billion years ago, roughly a quarter 2.5 billion years ago, till now at over two-thirds.Our own Milky Way has recently (in the 1990s) been confirmed to be a barred spiral, although the bar itself is difficult to observe from our position within the Galactic disk. The most convincing evidence for its existence comes from a recent survey, performed by the Spitzer Space Telescope, of stars in the Galactic center.Together with irregular galaxies, spiral galaxies make up approximately 60% of galaxies in the local Universe. They are mostly found in low-density regions and are rare in the centers of galaxy clusters.".
- Spiral_galaxy thumbnail M101_hires_STScI-PRC2006-10a.jpg?width=300.
- Spiral_galaxy wikiPageExternalLink spiral.html.
- Spiral_galaxy wikiPageExternalLink SpiralGalaxies.html.
- Spiral_galaxy wikiPageExternalLink sirtf.
- Spiral_galaxy wikiPageExternalLink spir.html.
- Spiral_galaxy wikiPageExternalLink text.asp?pid=1080.
- Spiral_galaxy wikiPageID "207620".
- Spiral_galaxy wikiPageRevisionID "604195610".
- Spiral_galaxy hasPhotoCollection Spiral_galaxy.
- Spiral_galaxy subject Category:Galaxy_morphological_types.
- Spiral_galaxy subject Category:Spiral_galaxies.
- Spiral_galaxy subject Category:Spirals.
- Spiral_galaxy comment "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.".
- Spiral_galaxy label "Galaktyka spiralna".
- Spiral_galaxy label "Galassia spirale".
- Spiral_galaxy label "Galaxia espiral".
- Spiral_galaxy label "Galaxie spirale".
- Spiral_galaxy label "Galáxia espiral".
- Spiral_galaxy label "Spiraalvormig sterrenstelsel".
- Spiral_galaxy label "Spiral galaxy".
- Spiral_galaxy label "Spiralgalaxie".
- Spiral_galaxy label "Спиральная галактика".
- Spiral_galaxy label "مجرة حلزونية".
- Spiral_galaxy label "渦巻銀河".
- Spiral_galaxy label "螺旋星系".
- Spiral_galaxy sameAs Spirální_galaxie.
- Spiral_galaxy sameAs Spiralgalaxie.
- Spiral_galaxy sameAs Σπειροειδής_γαλαξίας.
- Spiral_galaxy sameAs Galaxia_espiral.
- Spiral_galaxy sameAs Galaxia_kiribil.
- Spiral_galaxy sameAs Galaxie_spirale.
- Spiral_galaxy sameAs Galaksi_spiral.
- Spiral_galaxy sameAs Galassia_spirale.
- Spiral_galaxy sameAs 渦巻銀河.
- Spiral_galaxy sameAs 나선_은하.
- Spiral_galaxy sameAs Spiraalvormig_sterrenstelsel.
- Spiral_galaxy sameAs Galaktyka_spiralna.
- Spiral_galaxy sameAs Galáxia_espiral.
- Spiral_galaxy sameAs m.01dgzv.
- Spiral_galaxy sameAs Q2488.
- Spiral_galaxy sameAs Q2488.
- Spiral_galaxy wasDerivedFrom Spiral_galaxy?oldid=604195610.
- Spiral_galaxy depiction M101_hires_STScI-PRC2006-10a.jpg.
- Spiral_galaxy isPrimaryTopicOf Spiral_galaxy.
