SH2-221 is a large dim supernova remnant contrasting SH2-216 which is one of the largest, oldest, and closest planetary nebula known. These two represent 2 different stellar end of life scenarios. SH2-221 lies about 2600 lightyears away and is almost 2degrees across. There is a small bright nebula (SH2-219) sitting on SH2-221 which is a very young nebula, possibly only 100,000 years old, getting ionized by a bright B0 V star at the center. SH2-216 lies only 400 lightyears away from us and is very dim and diffuse due to its age. It is estimated that it is 500,000 years old, and is still faintly ionized by the central white dwarf ALS 8032. There are a couple dark nebula in between the 2 stellar corpses adding to the ghostly darkness.
Link to youtube video I made on the image:
https://youtu.be/RYRgEe2jArY
Close in views
SH2-219
X marks the spot:
Cosmic Lightning:
Eyes in the Dark:
Core around ALS 8032:
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