File:A globular cluster’s striking red eye NGC 2108.jpg
![File:A globular cluster’s striking red eye NGC 2108.jpg](http://upload.wikimedia.org/wikipedia/commons/thumb/f/fb/A_globular_cluster%E2%80%99s_striking_red_eye_NGC_2108.jpg/753px-A_globular_cluster%E2%80%99s_striking_red_eye_NGC_2108.jpg)
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摘要
描述A globular cluster’s striking red eye NGC 2108.jpg |
English: This Picture of the Week shows the colourful globular cluster NGC 2108. The cluster is nestled within the Large Magellanic Cloud, in the constellation of the Swordfish (Dorado). It was discovered in 1835 by the astronomer, mathematician, chemist and inventor John Herschel, son of the famous William Herschel.
The most striking feature of this globular cluster is the gleaming ruby-red spot at the centre left of the image. What looks like the cluster’s watchful eye is actually a carbon star. Carbon stars are almost always cool red giants, with atmospheres containing more carbon than oxygen — the opposite to our Sun. Carbon monoxide forms in the outer layer of the star through a combination of these elements, until there is no more oxygen available. Carbon atoms are then free to form a variety of other carbon compounds, such as C2, CH, CN, C3 and SiC2, which scatter blue light within the star, allowing red light to pass through undisturbed. This image was captured by the NASA/ESA Hubble Space Telescope’s Advanced Camera for Surveys (ACS), using three different filters. |
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来源 | https://www.spacetelescope.org/images/potw1832a/ |
作者 | ESA/Hubble & NASA |
许可协议
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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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说明
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描绘内容
知识共享署名4.0国际 简体中文(已转写)
6 8 2018
image/jpeg
数据大小 简体中文(已转写)
5,799,318 字节
3,110 像素
3,908 像素
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提供者 | ESA/Hubble & NASA |
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来源 | ESA/Hubble |
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数据生成日期时间 | 2018年8月6日 (一) 06:00 |
JPEG文件备注 | This Picture of the Week shows the colourful globular cluster, NGC 2108. The cluster is nestled within the Large Magellanic Cloud, in the constellation of the Swordfish (Dorado). It was discovered in 1835 by the astronomer, mathematician, chemist and inventor John Herschel, son of the famous William Herschel. The most striking feature of this globular cluster is the gleaming ruby-red spot at the centre left of the image. What looks like the cluster’s watchful eye is actually a carbon star. Carbon stars are almost always cool red giants, with atmospheres containing more carbon than oxygen — the opposite to our Sun. Carbon monoxide forms in the outer layer of the star through a combination of these elements, until there is no more oxygen available. Carbon atoms are then free to form a variety of other carbon compounds, such as C2, CH, CN, C3 and SiC2, which scatter blue light within the star, allowing red light to pass through undisturbed. This image was captured by the NASA/ESA Hubble Space Telescope’s Advanced Camera for Surveys (ACS) in 2016, using three different filters. |
关键词 | NGC 2108 |
联系信息 |
Karl-Schwarzschild-Strasse 2 Garching bei München, , D-85748 Germany |
IIM版本 | 4 |