A neutron star in the X-ray binary system 4U 1820-30 spins 716 times per second, making it one of the fastest-spinning objects ever observed, according to an analysis of data gathered by NASA’s Neutron Star Interior Composition Explorer (NICER) between 2017 and 2022. An artist’s depiction of the X-ray binary system 4U 1820-30 in the core of the globular cluster NGC 6624. Image credit: NASA. 4U 1820-30 is located about 26,000 light-years away from...
