Gamma-ray Astronomy
Solution

Characteristics
Satellite	Used in the 1960's or 1970's	Detects Gamma rays	Confirmed findings of Gamma ray background	Designed to detect flashes from nuclear bomb explosions	First to detect gamma rays from deep space	Used in the 1980's to study gamma rays from deep space	Carried instruments that have increased spacial and temporal resolution of gamma ray observations
OSO-3
SAS-2
COS-B
Vela Satellite Series
Soviet Venera Spacecraft
Pioneer Venus Orbiter
CGRO