- Ring galaxy
A ring galaxy is a
galaxywith 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 waveof star formation to move through the larger galaxy. Hoag's Object, discovered by Art Hoagin 1950is an example of such a galaxy.
* [http://antwrp.gsfc.nasa.gov/apod/ap020909.html Hoag's Object] at
Astronomy Picture of the Day.
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