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Galactic corona
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Galactic corona : ウィキペディア英語版
Galactic corona
The terms galactic corona and gaseous corona have been used in the first decade of the 21st century to describe a hot, ionised, gaseous component in the Galactic halo of the Milky Way. A similar body of very hot and tenuous gas in the halo of any spiral galaxy may also be described by these terms.
This coronal gas may be sustained by the galactic fountain, in which superbubbles of ionised gas from supernova remnants expand vertically through galactic chimneys into the halo. As the gas cools, it is pulled back into the galactic disc of the galaxy by gravitational forces.
==See also==

* Galaxy formation and evolution
* Galactic coordinate system
* Galactic bulge
* Disc galaxy
*
* Spiral arm
* Galactic halo
* Galactic spheroid

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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