Sh2-188 – A Planetary Nebula Moving Through the Interstellar Medium
Sh2-188 – A Planetary Nebula Moving Through the Interstellar Medium Sh2-188 is a planetary nebula located in the constellation of Cassiopeia, also catalogued as PN G128.0−04.1 and Simeiz 22. Its appearance is particularly striking: a bright filamentary arc dominates one side, while much fainter emission extends in the opposite direction. This morphology makes Sh2-188 one
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