420 years ago today German astronomer Johannes Kepler began observations of an exceptionally bright object, now known as Kepler's Supernova, that had appeared in the constellation Ophiuchus.

en.wikipedia.org

420 years ago today German astronomer Johannes Kepler began observations of an exceptionally bright object, now known as Kepler's Supernova, that had appeared in the constellation Ophiuchus.

en.wikipedia.org

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Anniversaries: X years ago todayEnglish · 13 days ago

Kepler's Supernova - Wikipedia

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