420 Years Ago: Astronomer Johannes Kepler Observes a Supernova

In October 1604, a new star appeared in the sky, puzzling astronomers of the day. First observed on Oct. 9, German astronomer Johannes Kepler 1571-1630 began his observations on Oct. 17 and tracked the new star for over a year. During that time, it brightened to magnitude -2.5, outshining Jupiter, and for several weeks remained 8230;. https://www.nasa.gov/histo...
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