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Today in History: Johannes Kepler observes bright supernova in Ophiuchus
10/17/2025
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Story summary
- On October 17, 1604, German astronomer Johannes Kepler began his observations of a bright celestial object, later named Kepler's Supernova, in the constellation Ophiuchus. This Type Ia supernova is notable for being the most recent supernova in the Milky Way observed with the naked eye, marking a significant moment in astronomical history.
