Monday, November 16, 2020

Close-up of the Cygnus supernova blast wave from a star 20 times the mass of our Sun that exploded between 10,000 and 20,000 years ago. It has since expanded 60 light-years from its center, traveling around 220 miles (354 km) per second. [1041 x 781] (Credit:ESA/NASA, W. Blair and Leo Shatz) via /r/spaceporn

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