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An explanation of the science and technology behind ESA's Infrared Space Observatory (ISO), due to be launched in 1993. The film includes: an explanation of the how the infra-red waveband is useful in astronomy; manufacture, design and functioning of the payload and service modules; and the purpose of the four scientific instruments.
Interviewees as follows: Chris Jewell, ESA; Martin Kessler, ESA; Albert Seidel, ESA; Pierre Collet, Aerospatiale.