Sh2-188 vs HFG 1
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Sh2-188
Sh2-188 is an asymmetric planetary nebula in Cassiopeia, notable for a bright bow-like rim caused by strong interaction with interstellar gas.
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HFG 1
HFG 1 is an old planetary nebula in Cassiopeia, shaped by the binary V664 Cas as it plows through interstellar gas and makes a bow shock.
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