HB 21 vs CTB 1
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HB 21
HB 21 is a mixed-morphology supernova remnant in Cygnus, discovered as a radio source in 1953 and known to interact with molecular clouds.
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CTB 1
CTB 1 is a large supernova remnant in Cassiopeia, discovered as a radio source in 1960 and also known by the nickname Medulla Nebula.
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