Which of the Following Statements About the Different Types (Shapes)

Which of the following statements about the different types (shapes) of galaxies is correct?

A) whatever type a galaxy is at its birth, that's what it will be for all time
B) all galaxies start out as ellipticals, but some later evolve to be spirals and irregulars
C) 90% of all galaxies are spirals (including our Milky Way) ; the other two types are very unusual
D) collisions and mergers between galaxies can sometimes change a galaxy's type (shape)
E) what type we see a galaxy to be just depends on the angle at which we happen to see it; all galaxies look roughly the same in shape
Section 26.3: Properties of Galaxies

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