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Herschel’s three instruments (from top): Heterodyne Instrument for the Far Infrared (HIFI), the Photodetector Array Camera and Spectrometer (PACS) and the Spectral and Photometric Imaging Receiver (SPIRE).
CREDIT
HIFI: SRON Netherlands Institute for Space Research, PACS: Max-Planck-Institut für extraterrestrische Physik, SPIRE: SPIRE Consortium