Historical supernova remnants

Cassiopeia_A_Spitzer

This is Cassiopeia A, from Chandra, HST and Spitzer. It may have been observed by John Flamsteed in 1680.

The supernova of 1572 is often called “Tycho’s supernova”, because of the extensive work De nova et nullius aevi memoria prius visa stella (“Concerning the Star, new and never before seen in the life or memory of anyone,” published in 1573, 1602, and 1610) that contains both Tycho Brahe’s own observations and the analysis of many other observers.

More Tycho history from the Galileo project

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