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Sh2-182 and the Interstellar Shell GSH 122+02-77
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Tucked away in Cassiopeia around 12,000 light years away lies the small HII region designated as Sh2-182. But it’s not at all the star of this show. That billing goes to the blue filamentary region catalogued as GSH 122+02-77 (GSH stands for Galactic Supershell).
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