CGRO (Compton Gamma-Ray Observatory)
December 20, 2022
An illustration of NASA’s CGRO spacecraft. The colors depicted in this illustration are for artistic purposes only.
CGRO, one of NASA's Great Observatories, studied the gamma-ray sky using four telescopes that detected different energies. The mission found a class of active galaxies called blazars, mapped the Milky Way’s distribution of a radioactive isotope of aluminum, and hinted at gamma-ray bursts’ cosmological origins, among other discoveries.
Launched: April 5, 1991
Decommissioned: June 4, 2000
