File:Different generations NGC 1866.jpg
原始檔案 (4,073 × 3,965 像素,檔案大小:8.07 MB,MIME 類型:image/jpeg)
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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來源 | https://www.spacetelescope.org/images/potw1847a/ |
作者 | ESA/Hubble & NASA |
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描繪內容
創用CC姓名標示4.0國際 繁體中文 (已轉換拼寫)
19 11 2018
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日期/時間 | 縮圖 | 尺寸 | 使用者 | 備註 | |
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目前 | 2022年7月11日 (一) 11:39 | 4,073 × 3,965(8.07 MB) | Don-vip | full-res | |
2018年11月20日 (二) 10:21 | 4,000 × 3,894(7.5 MB) | Jmencisom | User created page with UploadWizard |
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製作/提供者 | ESA/Hubble & NASA |
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來源 | ESA/Hubble |
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使用條款 |
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資料產生的日期時間 | 2018年11月19日 (一) 06:00 |
使用軟體 | Adobe Photoshop CC 2019 (Windows) |
檔案修改日期時間 | 2018年11月15日 (四) 15:22 |
數位化的日期時間 | 2017年9月30日 (六) 15:36 |
詮釋資料最後修改日期 | 2018年11月15日 (四) 16:22 |
原始文件唯一識別碼 | xmp.did:de497a58-23a5-7c43-9d66-3594a2606df9 |
關鍵字 | NGC 1866 |
聯絡資訊 |
Karl-Schwarzschild-Strasse 2 Garching bei München, None, D-85748 Germany |
IIM 版本 | 4 |