This weekend, casual observers and seasoned stargazers alike can see the death of a star 21 million light-years away. While that may sound incredibly far, this supernova is actually the closest to Earth in the last 25 years. Since astronomers caught the dramatic celestial event within hours of its explosion, the research community is pointing its telescopes toward the Pinwheel Galaxy in Ursa Major, better known as the Big Dipper.

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