Contact: Lynn Chandler
NASA/Goddard Space Flight Center
Caption: A James Webb Space Telescope flight spare primary mirror segment is loaded onto the CMM (Configuration Measurement Machine) at the CIAF (Calibration, Integration and Alignment Facility) at NASA's Goddard Space Flight Center in Greenbelt, Md. The CMM is used for precision measurements of the mirrors. These precision measurements must be accurate to 0.1 microns or 1/400th the thickness of a human hair.
Credit: Image credit: NASA Goddard/Chris Gunn Text: NASA/Rob Gutro
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