The two astronauts have a busy day ahead of them. Hague and Williams will "patch light leaks in the NICER X-ray telescope ... The instrument studies black holes, superdense stellar remnants ...

NASA astronaut Nick Hague will install patches to the agency's NICER (Neutron star Interior Composition Explorer) X-ray telescope on the ... erupting galaxies, black holes, superdense stellar ...

working to repair an X-ray telescope fitted to the exterior of the station called NICER (Neutron star Interior Composition Explorer). The astronauts are Nick Hague and Suni Williams, and they are ...