Beyond the Horizon of a Space-Warping Pulsar #SpaceSaturday

via Astronomy Now

A modest X-ray telescope aboard the International Space Station has provided the first accurate measurements of an isolated neutrons star’s size and mass. Taking advantage of how the concentrated gravity of massive stellar remnants bends light, the researchers even managed to peer beyond the target’s visible face to track the movement of million-degree hot spots across its surface.

“From its perch on the space station, NICER is revolutionising our understanding of pulsars,” said Paul Hertz, astrophysics division director at NASA Headquarters in Washington. “Pulsars were discovered more than 50 years ago as beacons of stars that have collapsed into dense cores, behaving unlike anything we see on Earth. With NICER we can probe the nature of these dense remnants in ways that seemed impossible until now.”

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