What Evidence Supports the Idea That a Collision Between Two

question 21

Multiple Choice

What evidence supports the idea that a collision between two spiral galaxies might lead to the formation of a single elliptical galaxy?

• A)the fact that elliptical galaxies dominate the galaxy populations at the cores of dense clusters of galaxies
• B)observations of giant elliptical galaxies at the center of dense clusters that may have grown by consuming other galaxies
• C)observations of some elliptical galaxies with stars and gas clouds in their cores that orbit differently from the other stars in the galaxy
• D)observations of some elliptical galaxies surrounded by shells of stars that probably formed from stars stripped out of smaller galaxies
• E)all of the above

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