| 词条 | Galactic corona |
| 释义 |
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. Galactic coronas have been and are currently being studied extensively, in the hope of gaining a further understanding of galaxy formation. Although, considering how galaxies differ in shaping and sizing, no particular theory has been able to adequately illustrate how the galaxies in the Universe originally formed.[1] See also
References1. ^{{Cite news|url=https://www.nasa.gov/image-feature/goddard/2017/hubbles-cool-galaxy-with-a-hot-corona|title=Hubble's Cool Galaxy with a Hot Corona|last=Hille|first=Karl|date=2017-09-22|work=NASA|access-date=2017-09-25|language=en}} External links
2 : Galactic astronomy|Extragalactic astronomy |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。