File:Abell21 - Noaoann09008a.jpg
原始檔案 （8,333 × 8,304 像素，檔案大小：33.01 MB，MIME 類型：image/jpeg）
摘要
| 描述 |
English: Medusa nebula, Abell 21
The Medusa nebula, known scientifically as Abell 21, is an old planetary nebula some 1,500 light-years away in the constellation Gemini. It is estimated to be over 4 light-years across. This image was taken on Oct 24th, 2008 at the Mayall telescope with the mosaic camera, with [OIII] (assigned a blue color) and H-alpha (orange) filters This image was released during the 100 Hours of Astronomy webcast, "Around the World in 80 Telescopes" held from April 3-4, 2009, during the International Year of Astronomy 2009. View the recorded event from KPNO. See also this image of NGC 6520 from CTIO, which was also released during the webcast. Credit: T. A. Rector/University of Alaska Anchorage and H. Schweiker/NOIRLab/NSF/AURA and NOIRLab/NSF/AURA |
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| 日期 | April 21, 2009 | ||||
| 來源 | https://noirlab.edu/public/images/noaoann09008a/ | ||||
| 作者 |
Credit: T. A. Rector/University of Alaska Anchorage and H. Schweiker/NOIRLab/NSF/AURA and NOIRLab/NSF/AURA |
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| 授權許可 (重用此檔案) |
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| 日期/時間 | 縮圖 | 尺寸 | 用戶 | 備註 | |
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| 目前 | 2021年11月22日 (一) 19:34 | | 8,333 × 8,304（33.01 MB） | Fabian RRRR | == {{int:filedesc}} == {{Information |description={{en|1='''Medusa nebula, Abell 21 The Medusa nebula, known scientifically as Abell 21, is an old planetary nebula some 1,500 light-years away in the constellation Gemini. It is estimated to be over 4 light-years across. This image was taken on Oct 24th, 2008 at the Mayall telescope with the mosaic camera, with [OIII] (assigned a blue color) and H-alpha (orange) filters This image was released during the 100 Hours of Astronomy webcast, "Aroun... |
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