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physical object > natural object > celestial body > collection of stars > galaxy > spiral galaxy > Sa spiral

Sa spiral comparison table

Subject	has definition	has synonym	is a kind of
spiral galaxy	A galaxy with a prominent nuclear bulge and luminous spiral arms of gas, dust, and young stars that wind out from the nucleus.		galaxy
Sa spiral	In Hubble's classification, a spiral with a large nuclear bulge and closely coiled arms.	early-type spiral	spiral galaxy

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