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physical object > natural object > celestial body > nebula > H II region > gaseous nebula > expanding emission nebula > supernova remnant > W44
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W44 comparison table
Subject is a kind of is an instance of has definition has distance
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. 
W44 supernova remnantA radio source. It is a supernova remnant less than 0°.5 from the galactic plane.3 kpc

Next supernova remnantW51    Upsupernova remnant    Previous supernova remnantVela supernova remnant