A neutron star's almost incomprehensible density causes protons and electrons to combine into neutrons—the process that gives such stars their name. The composition of their cores is unknown ...

The phenomenon was discovered thanks to NASA's Neutron Star Interior Composition Explorer (NICER), mounted on the ...

An X-ray observatory used to study neutron stars is “back in the black” and a cosmic ray detector is ready for possible ...

Neutron stars are very small and dense stars ... the interior is thought to contain layers of superfluid, although the composition of the innermost core is still unknown. The NICER mission ...

The two astronauts have a busy day ahead of them. Hague and Williams will "patch light leaks in the NICER X-ray telescope, ...

Suni Williams steps outside the International Space Station for the first time since arriving in June on Boeing’s Starliner.

LIVE: Two @NASA_Astronauts, Nick Hague and Suni Williams, step outside of the @Space_Station to support station upgrades, ...

Insights into metal alloy solidificationResearchers report details of phase and structure in the solidification of metal ...