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January 4, 2013
Rainer Strecker, Deutsches SOFIA Institut quality manager, conducts a final inspection and cleaning of the German Receiver for Astronomy at Terahertz Frequencies, or GREAT, spectrometer’s mounting plate prior to mating with the Stratospheric Observatory for Infrared Astronomy’s telescope. Alvin Mitchell, NASA quality assurance (left), and Rolf Guesten, principal investigator for GREAT (right), monitor the cleaning process. January 21, 2011 NASA Photo / Tom Tschida

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