A supernova remnant is the structure resulting from the explosion of a star in a supernova event. When a massive star exhausts its nuclear fuel, it undergoes gravitational collapse followed by a catastrophic explosion, ejecting the outer layers of the star into space at high velocities. This explosion not only disperses a vast amount of stellar material, but it also generates intense shock waves that propagate through the surrounding interstellar medium.
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A supernova remnant is the expanding ejecta and shocked ambient medium left by a supernova explosion.