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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Definitions:

Pronation

A rotation of the forearm or hand so that the palm faces downward or backward.

Supination

The rotational movement of the forearm or foot that turns the palm or sole outward or upward.

Dorsiflexion

The action of lifting the foot upwards towards the shin, decreasing the angle between the dorsum of the foot and the leg.

Periodontal Ligament

A group of specialized connective tissue fibers that attach a tooth to the alveolar bone, aiding in tooth stabilization.