The Compton Spectrometer and Imager is a NASA SMEX astrophysics mission that will launch a soft gamma-ray telescope in 2027. It is a wide-field compact Compton telescope that is uniquely suited to investigate the "MeV gap". From Wikipedia
The COSI mission aims to study gamma-ray emissions and the origins of elements in the Milky Way using SpaceX's Falcon 9 rocket.
