File:A Clear Reflection on Webb Telescope's Secondary Mirror (8169557139).jpg
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[edit]DescriptionA Clear Reflection on Webb Telescope's Secondary Mirror (8169557139).jpg |
The sole secondary mirror and another primary mirror that will fly aboard NASA's James Webb Space Telescope arrived at NASA's Goddard Space Flight Center in Greenbelt, Md., on Nov. 5, 2012. In this photo, technicians inspect the secondary mirror using flashlights. Reflections of one of the technicians and the roof of the giant clean room that houses the mirror are seen on the mirror's surface. Unlike the 18 hexagonal primary segments that make up the biggest mirror on the Webb telescope, the secondary mirror is perfectly rounded. The mirror is also convex, so the reflective surface bulges toward a light source. It looks much like the curved mirrors on the walls near parking garage exits that let motorists see around corners. The mirror is made of beryllium, which was selected for its stiffness, light weight and stability at cryogenic temperatures. Bare beryllium is not very reflective of near-infrared light, so each mirror is coated with gold. The microscopic gold coating enables the secondary mirror to efficiently reflect infrared light (which is what the Webb telescope's cameras see). The quality of the secondary mirror surface is so good that the final convex surface at cold temperatures does not deviate from the design by more than a few millionths of a millimeter -- or about one ten-thousandth the diameter of a human hair. Previously on Sept. 17, 2012, two other primary mirror segments arrived at NASA Goddard and are currently being stored in the giant clean room on campus. Ball Aerospace & Technologies Corp. of Boulder, Colo., manufactured, packed and shipped the mirrors to NASA Goddard. The most powerful space telescope ever built, the Webb telescope will provide images of the first galaxies ever formed and study planets around distant stars. It is a joint project of NASA, the European Space Agency and the Canadian Space Agency. Image credit: NASA/Chris Gunn NASA Goddard Space Flight Center enables NASA’s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a leading role in NASA’s accomplishments by contributing compelling scientific knowledge to advance the Agency’s mission. Follow us on Twitter Like us on Facebook Find us on Instagram |
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NASA Goddard Space Flight Center from Greenbelt, MD, USA
creator QS:P170,Q110278636 |
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This image was originally posted to Flickr by NASA Goddard Photo and Video at https://flickr.com/photos/24662369@N07/8169557139. It was reviewed on 17 September 2016 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
17 September 2016
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This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) | ![]() |
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current | 21:27, 17 September 2016 | ![]() | 3,378 × 2,183 (2.01 MB) | Vanished Account Byeznhpyxeuztibuo (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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