The Infrared Space Observatory (ISO) was the world's 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, 1999, The Nature Of Agn And Stellar Populations In High Redshift Powerful Radio Galaxies. Part 2, 1.0, European Space Agency, https://doi.org/10.5270/esa-nsrmfhm