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The extremely dense collapsed core of a massive dead star.
Neutron stars pack the mass of multiple suns into a sphere only about the size of a city. They possess immense gravitational and magnetic fields and represent one of the densest objects known in the universe.
Astronomers discovered that a repeating fake supernova is caused by a hidden black hole or neutron star stealing material from a massive, unstable star.
Cosmic energy flashes from distant galaxies have been transformed into musical tones playing daily inside a cathedral in Finland.
