
A dwarf galaxy is a small galaxy composed of up to several billion stars, a small number compared to our own Milky Way`s 200–400 billion stars. The Large Magellanic Cloud, which closely orbits the Milky Way and contains over 30 billion stars, is sometimes classified as a dwarf galaxy; others consider it a full-fledged galaxy. Dwarf galaxies` f.....
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http://en.wikipedia.org/wiki/Dwarf_galaxy

Small galaxy that contain a few million stars, it is the most common kind of galaxy in the universe.
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http://planetfacts.org/space-terms/

Dwarf irregular galaxy DDO 63. The blue regions are concentrations of young stars; the diffuse greenish/reddish area is the extended disk of older stars. Image credit: Lowell Observatory A small, faint galaxy, of which there are two main types. Dwarf irregular galaxies tend to contain a lot of g...
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http://www.daviddarling.info/encyclopedia/D/dwarfgal.html
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