A "collapsar" is a theoretical astronomical object that often refers to a massive star that undergoes gravitational collapse, leading to the formation of a black hole. The term is commonly associated with the study of gamma-ray bursts (GRBs), which are extremely energetic explosions observed in distant galaxies. These bursts are believed to be linked to the collapse of massive stars (collapsars) that are at least 30 times more massive than the Sun.
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