A spectrum of supernova faint remnant Cas A observed form my urban observatory (the supernova explosion was observed by Flamsteed in 1680). The spectrum is complex and lines very distorded by Doppler velocity (up to 10000 km/s) :
A long time fascinating object for me. See also the page: http://astrosurf.com/buil/nebula/remnant/3c461/obs.html
Christian B
Spectrum of Cas A (3C461)
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