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"Medusa Nebula (Abell 21)is a Planetary Nebula 1500LY away in Gemini.It is so faint it was not discovered till 1955.
Initially it was thought to be a supernova remnant.

Imaged with Atik 383+ Mono on Skywatcher M-N 190 F5.3/EQ6 with Baader NB filters. Ha 16 x 15 min subs and O111 10 x 15 min binned 2x2.Stacked in DSS and processed in Photoshop CS" [Ian Smith]