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Satellite galaxies of the Milky Way
The Milky Way has several smaller galaxies gravitationally bound to it, as part of the Milky Way subgroup. This subgroup is part of the local galaxy cluster, the Local Group.
There are about 30 small galaxies confirmed to be within of the Milky Way, though not all of them are necessarily in orbit. Of those, the only ones visible to the naked eye are the Large and Small Magellanic Clouds, which have been observed since prehistory. Measurements with the Hubble Space Telescope in 2006 suggest the Magellanic Clouds may be moving too fast to be orbiting the Milky Way. Of those galaxies confirmed to be in orbit, the largest is the Sagittarius Dwarf Elliptical Galaxy, which has a diameter of or roughly a fifth that of the Milky Way.
==Characteristics==
Satellite galaxies that orbit, from of the edge of the disc of the Milky Way Galaxy, to the edge of the dark matter halo of the Milky Way at from the center of the Galaxy,〔The distance to edge of the dark matter halo of the galaxy from its center is the virial radius of a galaxy, Rvir〕 are generally depleted in hydrogen gas compared to those that orbit more distantly. This region is the dense hot gas halo of the Milky Way, which strips cold gas from the satellites. Satellites beyond this region still retain copious quantities of gas.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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