Dropping in on a Webb Cleanroom Test
A crane in the cleanroom at NASA's Goddard Space Flight Center in Greenbelt, Md. is lowering a test mass simulator (white box and "X" frames) onto the Ambient Optical Assembly Stand or AOAS to ensure it can support the Webb Space Telescope's Optical Telescope Element during its assembly.
Credit: NASA/Chris Gunn
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Taken on August 7, 2013