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physical object > natural object > celestial body > nebula > H II region > gaseous nebula > expanding emission nebula > supernova remnant > Monoceros Loop
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Monoceros Loop comparison table
Subject is a kind of is an instance of has definition has distance has age
supernova remnantradio source A gaseous nebula, the expanding shell ejected by a supernova, and deriving its energy (at least in some cases) from the conversion by the remanent neutron star of its rotational energy into a stream of high-energy particles being continually accelerated in the SNR. About 100 SNRs are known in our Galaxy. Supernova remnants are usually powerful radio sources.  
Monoceros Loop supernova remnantA filamentary supernova remnant resembling a loop.1 kpc300000 years

Next supernova remnantPuppis A    Upsupernova remnant    Previous supernova remnantCygnus Loop