Neutron stars are ancient remnants of stars that have reached the end of their evolutionary journey through space and time.
These interesting objects are born from once-large stars that grew to four to eight times the size of our own sun before exploding in catastrophic supernovae. After such an explosion blows a star's outer layers into space, the core remains but it no longer produces nuclear fusion. With no outward pressure from fusion to counterbalance gravity's inward pull, the star collapses in upon itself.
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