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Discoveries are being made with each new observation of the Compton Gamma Ray Observatory (GRO) including an isotropic sky distribution of gamma- ray bursts, gamma-ray bright quasars, unusual gamma-ray pulsars, gamma- ray lines from explosive nucleosynthesis, and a uniform spatial distribution of positron-annihilation radiation from the disk of our Galaxy. Many of the results are surprising and are challenging our understanding of the high-energy sky. GRO was launched on 5 April 1991 and is in generally good health. The observatory is performing the first full-sky survey over a broad gamma-ray spectral band with an order of magnitude better sensitivity than previous missions. Results from the first 3 years of the mission will be presented.
