File:NGC7331 - HST - Potw1805a.tif
原始文件 （4,061 × 3,038像素，文件大小：29.42 MB，MIME类型：image/tiff）
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English: Twins with differences
Astronomers took this image using Hubble’s Wide Field Camera 3 (WFC3), as they were observing an extraordinary exploding star — a supernova — which can still be faintly seen as a tiny red dot near the galaxy’s central yellow core. Named SN2014C, it rapidly evolved from a supernova containing very little Hydrogen to one that is Hydrogen-rich — in just one year. This rarely observed metamorphosis was luminous at high energies and provides unique insight into the poorly understood final phases of massive stars. NGC 7331 is similar in size, shape, and mass to the Milky Way. It also has a comparable star formation rate, hosts a similar number of stars, has a central supermassive black hole and comparable spiral arms. The primary difference between our galaxies is that NGC 7331 is an unbarred spiral galaxy — it lacks a “bar” of stars, gas and dust cutting through its nucleus, as we see in the Milky Way. Its central bulge also displays a quirky and unusual rotation pattern, spinning in the opposite direction to the galactic disc itself. By studying similar galaxies we hold a scientific mirror up to our own, allowing us to build a better understanding of our galactic environment which we cannot always observe, and of galactic behaviour and evolution as a whole. Credit: ESA/Hubble & NASA/D. Milisavljevic (Purdue University) Coordinates Position (RA): 22 37 5.34 Position (Dec): 34° 24' 31.42" Field of view: 2.68 x 2.01 arcminutes Orientation: North is 56.3° right of vertical Colours & filters Band Wavelength Telescope Optical u 336 nm Hubble Space Telescope WFC3 Ultraviolet uv 275 nm Hubble Space Telescope WFC3 Optical B 438 nm Hubble Space Telescope WFC3 Optical V 555 nm Hubble Space Telescope WFC3 Optical I 814 nm Hubble Space Telescope WFC3 Optical H-Alpha +NIII 657 nm Hubble Space Telescope WFC3. |
| 日期 | 29 January 2018, 06:00 (release) |
| 来源 | https://www.spacetelescope.org/images/potw1805a/ |
| 作者 | Credit: ESA/Hubble & NASA/D. Milisavljevic (Purdue University) |
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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/时间 | 缩略图 | 大小 | 用户 | 备注 | |
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| 当前 | 2018年1月29日 (一) 05:52 |  | 4,061 × 3,038（29.42 MB） | Fabian RRRR（留言 | 贡献） | =={{int:filedesc}}== {{Information |description={{en|1='''Twins with differences Twins with differences This NASA/ESA Hubble Space Telescope image shows a spiral galaxy known as NGC 7331. First spotted by the prolific galaxy hunter William Herschel in... |
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