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

Source: space
Source Link: https://www.space.com/x-ray-telescope-weighs-pulsar-nasa-iss