File:Different generations NGC 1866.jpg
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摘要
描述Different generations NGC 1866.jpg |
English: Star clusters are common structures throughout the Universe, each made up of hundreds of thousands of stars all bound together by gravity. This star-filled image, taken with the NASA/ESA Hubble Space Telescope’s Wide Field Camera 3 (WFC3), shows one of them: NGC 1866.
NGC 1866 is found at the very edges of the Large Magellanic Cloud, a small galaxy located near to the Milky Way. The cluster was discovered in 1826 by Scottish astronomer James Dunlop, who catalogued thousands of stars and deep-sky objects during his career. However, NGC 1866 is no ordinary cluster. It is a surprisingly young globular cluster situated close enough to us that its stars can be studied individually — no mean feat given the mammoth distances involved in studying the cosmos! There is still debate over how globular clusters form, but observations such as this have revealed that most of their stars are old and have a low metallicity. In astronomy, ‘metals’ are any elements other than hydrogen and helium; since stars form heavier elements within their core as they carry out nuclear fusion throughout their lifetimes, a low metallicity indicates that a star is very old, as the material from which it formed was not enriched with many heavy elements. It’s possible that the stars within globular clusters are so old that they were actually some of the very first to form after the Big Bang. In the case of NGC 1866, though, not all stars are the same. Different populations, or generations, of stars are thought to coexist within the cluster. Once the first generation of stars formed, the cluster may have encountered a giant gas cloud that sparked a new wave of star formation and gave rise to a second, younger, generation of stars — explaining why it seems surprisingly youthful. |
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来源 | https://www.spacetelescope.org/images/potw1847a/ |
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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描繪內容
19 11 2018
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当前 | 2022年7月11日 (一) 11:39 | ![]() | 4,073 × 3,965(8.07 MB) | Don-vip | full-res |
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提供者 | ESA/Hubble & NASA |
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来源 | ESA/Hubble |
简短标题 |
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使用条款 |
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数据生成日期时间 | 2018年11月19日 (一) 06:00 |
使用软件 | Adobe Photoshop CC 2019 (Windows) |
文件修改日期时间 | 2018年11月15日 (四) 15:22 |
数字化日期时间 | 2017年9月30日 (六) 15:36 |
元数据最后修改日期 | 2018年11月15日 (四) 16:22 |
原始文件唯一ID | xmp.did:de497a58-23a5-7c43-9d66-3594a2606df9 |
关键词 | NGC 1866 |
联系信息 |
-{R|http://www.spacetelescope.org}- Karl-Schwarzschild-Strasse 2 Garching bei München, None, D-85748 Germany |
IIM版本 | 4 |