The Infrared Space Observatory (ISO) was the worlds first true orbiting infrared observatory. Equipped with four highly-sophisticated and versatile scientific instruments, it was launched by Ariane in November 1995 and provided astronomers world-wide with a facility of unprecedented sensitivity and capabilities for a detailed exploration of the Universe at infrared wavelengths.
European Space Agency, SPINOGLIO et al., 1999, 'IR ENERGY DISTRIBUTIONS AND IMAGING OF THE 12UM ACTIVE GALAXIES TOWARDS A UNIFICATION SCHEME OF ACTIVE GALACTIC NUCLEI. PART 2', 1.0, European Space Agency, https://doi.org/10.5270/esa-lrg9hyg