420 Years Ago: Astronomer Johannes Kepler Observes a Supernova nasa.gov/history/420-years-ago… #NASA #NASAHistory
420 Years Ago: Astronomer Johannes Kepler Observes a Supernova - NASA
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)Kelli Mars (NASA)