What should the surface of a neutron star look like?
<p>They appear different because they were performed by two different research groups, who worked on the same data provided by the NICER X-ray telescope, installed in 2017 on the ISS.<br />
One of the two groups concluded that there are two hotspots in the southern hemisphere, while the other believes there are three.</p>
<p>The star’s surface is subject to relativistic effects, such that part of the opposite hemisphere is visible in one hemisphere. As well as perturbed by the star’s still unclear internal dynamics and the magnetic field it generates.</p>
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