Why Should Galaxy Collisions Have Been More Common in the Past

question 136

Multiple Choice

Why should galaxy collisions have been more common in the past than they are today?

• A) Galaxies were more active in the past and therefore would have collided with each other more frequently.
• B) Galaxies were much bigger in the past because they had not contracted completely.
• C) Galaxies were closer together in the past because the universe was smaller.
• D) Galaxies attracted each other more strongly in the past because they were more massive; they had not yet turned most of their mass into stars and light.
• E) Galaxy collisions shouldn't have been more common in the past than they are now.

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