The Gemini North secondary mirror (M2) undergoing recoating during a maintenance shutdown in September 2015. Here, the nickelchromium layer is sputtered onto the mirror’s surface by the magnetron. The pink illumination is provided by glowing plasma excited by the
magnetron. Photo by Thomas Schneider.
The Gemini Observatory is operated by the Association
of Universities for Research in Astronomy, Inc., under
a cooperative agreement with the National Science
Foundation on behalf of the Gemini Partnership.
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