File:1001 Stars.jpg
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| Description |
English: Taken from inside the dome of the fourth Unit Telescope of ESO’s Very Large Telescope (VLT), this spectacular shot from ESO Photo Ambassador Yuri Beletsky captures the VLT’s Laser Guide Star (LGS) in action.
The LGS, located on top of the 1.2-metre secondary mirror of Unit Telescope 4, is part of the VLT’s adaptive optics system. By creating a glowing spot — an artificial star — in the Earth’s atmosphere at an altitude of 90 kilometres, the light coming back from the laser can be used as a reference to remove the effects of atmospheric distortion. This allows the telescope to produce astronomical images almost as sharp as if the telescope were in space. The plane of the Milky Way, seemingly pierced by the laser as it soars above the open dome of the telescope, is rippled with dark clouds of interstellar dust that block visible light. However, thanks to the telescope’s infrared instruments and the adaptive optics system, astronomers can study and image our galaxy’s complex and turbulent core in unprecedented detail.中文：图为ESO甚大望远镜（VLT）第四单元的内部，ESO照片大使Yuri Beletsky拍摄到正在工作的激光导星装置（LGS）。
激光导星装置安装在VLT的第四单元内1.2米口径的副镜顶上，该装置甚大望远镜的自适应光学系统的一部分。通过创建一个发光点——一个人造星——离地面90km的地球大气中，把从人造星反射的激光作为参考，以消除大气效应对图像失真的影响。这使得望远镜产生的天文图像几乎和太空望远镜产生的图像一样锐利。 圆屋顶开出的缝隙正对着银盘，从这里可以清晰的看出银河的尘埃挡住后面射来的光线。然而，由于望远镜的红外仪器和自适应光学系统的存在，天文学家也可以在研究我们星系复杂、动荡的核心中，提供前所未有的细节。 |
| Date | (released) |
| Source | http://www.eso.org/public/images/potw1639a/ |
| Author | Y. Beletsky (LCO)/ESO |
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This media was created by the European Southern Observatory (ESO).
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. |
  This file is licensed under the Creative Commons Attribution 4.0 International license.
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