Neutron stars are some of the most extreme objects in the universe. Although they are only about the size of a city, they contain more mass than the Sun and have the strongest magnetic fields known.

They form when a very massive star runs out of fuel and can no longer support itself against gravity. The star’s core collapses so violently that electrons and protons are crushed together, forming neutrons.

What remains after the star explodes as a supernova is a neutron star. Because so much mass is packed into such a small space, neutron stars are incredibly dense. A tiny amount of their material would weigh billions of tons on Earth. Their gravity is second only to black holes, and their surfaces reach temperatures of millions of degrees.

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