NuSTAR observations have helped to identify a pulsar wind nebula in the Galactic Center as a new candidate source of very high energy cosmic rays.

Working together with NASA's Imaging X-ray Polarimetry Explorer (IXPE), NuSTAR is helping to reveal the structure of the corona around black holes.

Known as ultraluminous X-ray sources, the emitters are easy to spot when viewed straight on, but they might be hidden from view if they point even slightly away from Earth.