When massive stars explode violently, it can lead to a supernova. If the core survives, it may become a neutron star. The rapid collapse of the outer part of the star leads to temperatures of over 1,000 million C and leaves the core with an average diameter of just 20 km. However, the star still has a mass of up to 3 times that of our Sun making it incredibly dense. One teaspoonful of neutron star weighs over 3 billion tonnes!
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