Ring galaxy


Ring galaxy

A ring galaxy is a galaxy with a ring-like appearance. The ring consists of massive, relatively young blue stars, which are extremely bright. The central region contains relatively little luminous matter. Astronomers believe that ring galaxies are formed when a smaller galaxy passes through the center of a larger galaxy. Because most of a galaxy consists of empty space, this "collision" rarely results in any actual collisions between stars. However the gravitational disruptions caused by such an event could cause a wave of star formation to move through the larger galaxy.

Hoag's Object, discovered by Art Hoag in 1950 is an example of such a galaxy.

ee also

*Interacting galaxy

External links

* [http://antwrp.gsfc.nasa.gov/apod/ap020909.html Hoag's Object] at Astronomy Picture of the Day.


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • ring galaxy — Astron. a galaxy having the shape of an elliptical ring: thought to be the result of a collision of two galaxies. * * * …   Universalium

  • ring galaxy — Astron. a galaxy having the shape of an elliptical ring: thought to be the result of a collision of two galaxies …   Useful english dictionary

  • Polar-ring galaxy — A polar ring galaxy is a type of galaxy in which an outer ring of gas and stars rotates over the poles of the galaxy.cite book author=James Binney, Michael Merrifield year=1998 title=Galactic Astronomy publisher=Princeton University Press… …   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 Quest — Theatrical release poster Directed by Dean Parisot Produced by …   Wikipedia

  • Galaxy Express 999 : Eternal Fantasy — Galaxy Express 999 : Eternal Fantasy Données clés Titre original 銀河鉄道999 エターナルファンタジー Réalisation Kônosuke Uda Scénario Junki Takegami d après Leiji Matsumoto Sociétés de production Tōei Animation Pays d’origine …   Wikipédia en Français

  • 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

  • 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

  • Galaxy Zoo — Infobox Website name = Galaxy Zoo caption = url = http://www.galaxyzoo.org commercial = No type = Volunteer Scientific Project language = English, Polish registration = Yes owner = Galaxy Zoo Team author = Galaxy Zoo Team launch date = 12 July… …   Wikipedia

  • Ring Nebula (NGC 6822) — Diffuse nebula name = Ring Nebula in Barnard s Galaxy type = Emission epoch = J2000.0 ra = 19h 44m 36s dec = 14° 41 prime; 42 Prime; dist ly = 1.63 million ly dist pc = 0.500 Mpc appmag v = 14.5 size v = 53 Prime; constellation = Sagittarius… …   Wikipedia


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.