Tallest Mountains On Neutron Stars May Be Only Millimetres High Due To Huge Gravity

Artist’s depiction of a neutron star. Credit: ESO / L. Calçada

New models of neutron stars show that their tallest mountains may be only fractions of millimeters high, due to the huge gravity on the ultra-dense objects. The research is presented today at the National Astronomy Meeting 2021.

Neutron stars are some of the densest objects in the Universe: they weigh about as much as the Sun, yet measure only around 10km across, similar in size to a large city. Because of their compactness, neutron stars have an enormous gravitational pull around a billion times stronger than the Earth. This squashes every feature on the surface to minuscule dimensions and means that the stellar remnant is an almost perfect sphere.

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