However shell or arc like local density enhancements of the interstellar gas may be formed by various processes, most of the radio loops are explained as 2D projected views of bubble shaped supernova remnants.
(D; projected; views of bubble shaped supernova remnants) (most of the radio loops; are explained; as 2D projected views of bubble) Context(most of the radio loops are explained,List([113, 150))):(However shell or arc like local density enhancements of the interstellar gas; may be formed; by various processes)
most of the radio loops are explained,List([113, 150))
D most of the radio loops However shell or arc like local density enhancements of the interstellar gas
projected are explained may be formed
views of bubble shaped supernova remnants
as 2D projected views of bubble
by various processes