Title: The galactic and extragalactic background radiation
Subtitle: proceedings of the 139th Symposium of the International Astronomical Union, held in Heidelberg, F.R.G., June 12-16, 1989
Subjects: Congresses, Cosmic background radiation, Infrared astronomy, Ultraviolet astronomy, Galaxies, Rayonnement du fond du ciel, Congrès, Astronomie ultraviolette, Astronomie infrarouge, Rayonnement cosmologique, Kosmische Hintergrundstrahlung, Kongress, Infraroodstraling, Ultraviolette straling, Sterrenstelsels