Neutron stars are the densest stars that have been identified.
The gravitational collapse of a big star during a supernova explosion can produce a specific kind of stellar remnant called a neutron star. The smallest and densest stars known to exist in the universe are neutron stars, which have a radius of just around 12–13 km (6 mi) with a mass that may be a few times that of the Sun.
In fact, these stars are so dense that spacetime itself may actually wiggle due to the gravity of the mountain-sized flaws on their surfaces. If so, neutron stars might provide fresh information about the puzzling phenomena known as gravity waves.
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