Which of the following could explain the origin of the S0 type galaxies? A. When

Question

Which of the following could explain the origin of the S0 type galaxies?
A. When they were young, S0 galaxies used all their disk material and
formed stars all in one burst
B. S0 galaxies are spirals that lost their dust and gas in a collision with
hot intergalactic gas
C. S0 galaxies are spirals that lost their spiral arms because of their
rapid rotation
D. All of the choices are viable explanations.
E. Only when they were young, S0 galaxies used all their disk material
and formed stars all in one burst and S0 galaxies are spirals that lost their dust
and gas in a collision with hot intergalactic gas are viable explanations.

Explanation / Answer

C. S0 galaxies are spirals that lost their spiral arms because of their rapid rotation

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