If a red giant is between ten and thirty times the mass of the Sun and its core survives a supernova, it ends its life as a neutron star. A neutron star is the core of a red giant which is so compressed through the force of its own gravity that its protons and electrons have been squashed together and have finished up as neutrons*. A neutron star may be as little as 15 km in diameter but so dense that a teaspoonful would weigh 10000000000000 newtons* on Earth. (That's 1013 newtons.)
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