Gavin Bent/Kaleb Jordan SNR G206.9+2.3 is all that remains of a star that exploded in Monoceros about 7,000 light-years away. Arguably overshadowed by neighboring objects like the Rosette Nebula, this object features delicate, nested shells of emission caused by the supernova’s blast wave as it plows through surrounding gas and dust. It spans roughly 50′,Continue reading "An ancient shockwave"