This is a large equipment piece - balloon-borne Radiometer/Spectrometer from the Far Infrared Survey. This piece was flown in 1988, and consists of the dewar compartments and deteection equipment used in the infrared survey. This piece was flown a number of times in 1988 and 1989, and collected important information on the study of the universe's background radiation.
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The FIRS project showed that the far infrared radiation background is very similar in form to the microwave background measured by the earlier COBE satellite mission, in that its intensity agrees with that of a perfect thermal radiator at 3 degrees Kelvin. This observation provided additional support for the Hot Big Bang theory for the origin of the universe. After flight, the payload was cut in half by its makers for display purposes, mainly to show the sophisticated double refrigeration system that maintained the detector at 0.245 degrees Kelvin. The first half with most of the original internal parts went to the Adler Planetarium, and NASM acquired the remaining half, which underwent reconstruction by students from the Art Institute of Pittsburgh. The artifact was donated to NASM by Edward S. Cheng and Stephan S. Meyer in July 2001 and is now displayed in the Explore the Universe gallery.
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