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Galaxy X (galaxy)
Galaxy X〔 is a postulated dark satellite dwarf galaxy of the Milky Way Galaxy. If it exists, it would be composed mostly of dark matter and interstellar gas with few stars.〔〔 Its claimed location is some from the Sun,〔〔〔 behind the disk of the Milky Way,〔 and some in extent.〔 Galactic coordinates would be (l=
-27.4°,b=-1.08°).〔
==Discovery==
Observational evidence for this galaxy was presented in 2015, based on the claimed discovery of four, Cepheid variable stars.〔 Search for the stars was motivated by an earlier study that linked a warp in the HI (atomic hydrogen) disk of the Milky Way Galaxy to the tidal effects of a perturbing galaxy.〔 The unseen perturber's mass was calculated to be about 1%〔approximately 10 billion solar masses〕 of that of the Milky Way,〔 which would make it the third heaviest satellite of the Milky Way, after the Magellanic Clouds (LMC and SMC, each some 10x larger than Galaxy X).〔 In this theoretical model, the putative satellite galaxy would have interacted with the Milky Way some 600 million years ago, coming as close as , and would now be on its way away from the Milky Way.〔〔〔
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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