Abstract
A new window for studying our Galaxy has emerged after over two decases of concerted effort with satellite and balloon‐borne gammay‐ray experiments. These experiments have discovered what appears to be a diffuse glow along the Galactic plane in lines at 0.511 and 1.809 MeV. I summarize these observations, with emphasis on measurements made with the Gamma‐Ray Spectrometer (GRS) on NASA’s Solar Maximum Mission satellite (SMM). The GRS is currently being used to study other diffuse Galactic emissions including the positronium continuum, radioactive lines from recent supernovae and novae, and de‐excitation lines from interactions of cosmic‐ray protons with interstellar carbon and oxygen.
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