SVSU PHYS106c Keen Chp 16
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9 Terms
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grand design spiral galaxy
a spiral galaxy with well-defined spiral arms that may be traced all the way from the bulge to the outer regions of the disk
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flocculent spiral galaxy
a spiral galaxy with poorly defined spiral arms
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barred spiral galaxy
a spiral galaxy with a central rectangular bar
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bar
a thick rectangular region of stars extending across the center of some spiral galaxies
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elliptical galaxy
a galaxy that appears elliptical on the sky. They are generally triaxial, meaning that the width is different in each dimension
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giant elliptical galaxy
the largest, most massive type of elliptical galaxy
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irregular galaxy
an amorphous galaxy lacking common structures
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lenticular galaxy
a galaxy with a bulge, limited evidence of a disk, and no spiral arms
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Hubble tuning-fork diagram
Edwin Hubble's scheme for representing galaxy types along a progression from highly elliptical to spiral or barred
Note 
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