Best Cometary Knots
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1
Crescent-shaped planetary nebula in Cassiopeia whose asymmetric dolphin-like arc is caused by the central white dwarf's supersonic proper motion through the interstellar medium, creating a one-sided bow shock.
2
A planetary nebula in Serpens notable for its cometary morphology, caused by rapid motion through the interstellar medium that produces a bright leading edge and an extended trailing tail.
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