File:A Deep Look into a Dark Sky.jpg
![File:A Deep Look into a Dark Sky.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/2/23/A_Deep_Look_into_a_Dark_Sky.jpg/629px-A_Deep_Look_into_a_Dark_Sky.jpg?20140801053636)
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[编辑]描述A Deep Look into a Dark Sky.jpg |
English: Can you count the number of bright dots in this picture? This crowded frame is a deep-field image obtained using the Wide Field Imager (WFI), a camera mounted on a relatively modestly sized telescope, the MPG/ESO 2.2-metre located at the La Silla Observatory, Chile.
This image is one of five patches of sky covered by the COMBO-17 survey (Classifying Objects by Medium-Band Observations in 17 filters), a deep search for cosmic objects in a relatively narrow area of the southern hemisphere's sky. Each one of the five patches is recorded using 17 individual colour filters. Each one of the five COMBO-17 images covers an area of the sky the size of the full Moon. The survey has already revealed thousands of previously unknown cosmic specimens — over 25 000 galaxies, tens of thousands of distant stars and quasars previously hidden from our view, showing just how much we still have to learn about the Universe. Some of the most distant flecks of light visible in this photo are galaxies whose light has been travelling for nine or ten billion years before reaching to us. By studying galaxies of different ages astronomers can understand how they evolve in time, from mature nearby galaxies similar to our galaxy, the Milky Way, to young ones in the distant Universe that reveal what the cosmos was like in its infancy. |
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来源 | http://www.eso.org/public/images/potw1428a/ |
作者 | ESO |
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Their website states: "Unless specifically noted, the images, videos, and music distributed on the public ESO website, along with the texts of press releases, announcements, pictures of the week, blog posts and captions, are licensed under a Creative Commons Attribution 4.0 International License, and may on a non-exclusive basis be reproduced without fee provided the credit is clear and visible." To the uploader: You must provide a link (URL) to the original file and the authorship information if available. |
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来源 | European Southern Observatory |
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提供者 | ESO |
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使用条款 |
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数据生成日期时间 | 2014年7月14日 (一) 10:00 |
关键词 | COMBO-17 survey |
联系信息 |
Karl-Schwarzschild-Strasse 2 Garching bei München, , D-85748 Germany |
IIM版本 | 4 |