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A neutron star has been clocked travelling at more than 1500 kilometres per second. It joins the ranks of other fast moving neutron stars, deepening the puzzle over how these dense stellar corpses are accelerated to such astonishing velocities.
Neutron stars are the city-sized spheres that remain after stars are destroyed in supernova explosions. They are incredibly dense – a teaspoonful of neutron star material would weigh a billion tonnes.
