Word: tycho
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Dates: during 1940-1949
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...everybody except impatient astronomers, they do not seem to occur very often. Each star system, such as N.G.C. 6964 and the earth's own Milky Way galaxy, is thought to average one such catastrophe in about 600 years. The brightest local outburst, thought to be a supernova, was Tycho's Star, which exploded in 1572 and was bright enough to be seen in daytime...
...star shone temporarily ten times brighter than the moon," said Rudolph Minkowski of Mount Wilson Observatory, "and was visible for a full month in the daytime sky. It was . . . one of the three supernovae which have appeared in the Milky Way during the last thousand years. The others were Tycho's star in 1572, and Kepler's Nova of 1604." In Pasadena next day Minkowski's colleague, Walter Baade, announced finding the debris of Kepler's supernova, which for a while shone as bright at its source as 25,000 suns...