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a gigantic explosion in which a massive star collapses and throws its outer layers into space
a star that has collapsed under gravity to the point that the electrons and protons have smashed together to form neutrons
a large cloud of dust and gas in interstellar space; a region in space where stars are born or where stars explode at the end of their lives
Hertzsprung-Russell diagram, a graph that shows the relationship between a star's surface temperature and absolute magnitude
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