Canis Major Dwarf
An irregular dwarf galaxy that is a satellite of our own Milky Way Galaxy. It lies in the constellation Canis Major at a distance of only 25,000 light-years from the Sun and 42,000 light-years from the center of the Milky Way. Although it is the closest known satellite galaxy to the center of the Milky Way, pushing the Sagittarius Dwarf Elliptical (SagDEG) into second place, it is well hidden behind banks of dust in the plane of the Milky Way and was discovered thanks to the infrared glow of its M-type (red) giants by the Two-Micron All Sky Survey (2MASS) as recently as 2003.
Both the Canis Major and Sagittarius Elliptical dwarfs are merging with, or being cannibalized by, the Milky Way – a process that will have run to completion within another billion years or so.
Related category GALAXIES
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