cosmic gamma ray background
(gamma-ray radiation seen everywhere)
Cosmic gamma-ray background (CGB) radiation
is weak gamma-ray radiation detectable in many directions.
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.
Referenced by pages:
cosmic background radiation (CBR)
gamma rays (GR)