cosmic gamma ray background
(gamma-ray radiation seen everywhere)
Cosmic gamma-ray background (CGB) radiation is weak gamma-ray
radiation detectable in many directions, from beyond the Milky Way.
It is presumed to come from a variety of sources such as blazars,
radio galaxies, star forming galaxies, and perhaps supernovae.
By definition, it constitutes part of the cosmic background radiation (CBR).
Referenced by pages:
cosmic background radiation (CBR)
gamma rays (GR)