File:NGC 2273 galaxy.jpg
原始檔案 （3,924 × 3,054 像素，檔案大小：4.39 MB，MIME 類型：image/jpeg）
摘要
| 描述 |
English: At first glance, the subject of this NASA/ESA Hubble Space Telescope image looks to be a simple spiral galaxy, with two pinwheeling arms emerging from a central bar of stars and material that cuts through the galactic centre. In fact, there are rings within these spiral arms, too: spirals within a spiral.
This kind of morphology is known as a multiring structure. As this description suggests, this galaxy, named NGC 2273, hosts an inner ring and two outer “pseudorings” — having so many distinct rings is rare, and makes NGC 2273 unusual. Rings are created when a galaxy’s spiral arms appear to loop around to nearly close upon one another, combined with a trick of cosmic perspective. NGC 2273’s two pseudorings are formed by two swirling sets of spiral arms coming together, and the inner ring by two arcing structures nearer to the galactic centre, which seem to connect in a similar way. These rings are not the only unique feature of this galaxy. NGC 2273 is also a Seyfert galaxy, a galaxy with an extremely luminous core. In fact, the centre of a galaxy such as this is powered by a supermassive black hole, and can glow brightly enough to outshine an entire galaxy like the Milky Way. Credit: ESA/Hubble & NASA, J. Greene |
| 日期 | |
| 來源 | https://www.spacetelescope.org/images/potw2014a/ |
| 作者 | ESA/Hubble & NASA, J. Greene |
授權條款
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ESA/Hubble images, videos and web texts are released by the ESA under the Creative Commons Attribution 4.0 International license and may on a non-exclusive basis be reproduced without fee provided they are clearly and visibly credited. Detailed conditions are below; see the ESA copyright statement for full information. For images created by NASA or on the hubblesite.org website, or for ESA/Hubble images on the esahubble.org site before 2009, use the {{PD-Hubble}} tag.
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| 日期/時間 | 縮圖 | 尺寸 | 用戶 | 備註 | |
|---|---|---|---|---|---|
| 目前 | 2022年7月11日 (一) 11:53 | | 3,924 × 3,054（4.39 MB） | Don-vip | full-res |
| 2020年5月19日 (二) 12:46 |  | 1,280 × 996（157 KB） | Garamora | Uploaded a work by ESA/Hubble & NASA, J. Greene from https://www.spacetelescope.org/images/potw2014a/ with UploadWizard |
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