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2011: The German Receiver for Astronomy at Terahertz Frequencies spectrometer, or GREAT, is mounted on the SOFIA's telescope in its normal position. When observing, the instrument will move with the telescope plus or minus 20 degrees from its normal 40-degree angle. The GREAT instrument was designed and built by Rolf Gusten and his team at the Max-Pianck-lnstitut fur Radioastronomie, Bonn, Germany, and the First Physics Institute at the University Cologne, Germany, and other German institutes. (NASA/Tom Tschida)

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