Before a supernova finally explodes, its progenitor ejects massive amounts of gas into its surroundings. When the doomed star finally explodes, its blast wave slams into this material. This is one of a supernova's signatures, and researchers have figured out how to detect it.
Before a supernova finally explodes, its progenitor ejects massive amounts of gas into its surroundings. When the doomed star finally explodes, its blast wave slams into this material. This is one of a supernova's signatures, and researchers have figured out how to detect it.
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