NASA's ISS-mounted X-ray telescope NICER has weighed and measured the closest pulsar to Earth. The neutron star PSR J0437 spins 174 times a second and has a mass of 1.4 suns.
NASA X-ray telescope 'weighs' the closest rapidly spinning dead star to Earth : Read more
NASA X-ray telescope 'weighs' the closest rapidly spinning dead star to Earth : Read more