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Webb Telescope Engineers to Test COCOA

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GREENBELT, Md., Dec. 22, 2011 — To verify the optical performance of the mirrors on the James Webb Space Telescope, NASA is using COCOA (center of curvature optical assembly) to check that the mirrors are perfectly shaped and will work in the frosty environment of space. Curvature is important in a mirror, just as the convex side mirrors on your car are shaped to give you a wide field of vision behind and beside your car. COCOA tests on the Webb telescope’s concave mirror segments are critical because they will tell engineers if all of the mirrors are working together to make a telescope that has the correct...Read full article

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