A supernova is a stellar explosion that
briefly outshines an entire galaxy, radiating as much energy as the Sun
or any ordinary star is expected to emit over its entire life span,
before fading from view over several weeks or months.
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A supernova is a stellar explosion that
briefly outshines an entire galaxy, radiating as much energy as the Sun
or any ordinary star is expected to emit over its entire life span,
before fading from view over several weeks or months.