Which of these statements about galactic motions and interactions is MOST accurate?
A) Galaxies occasionally collide with one another, particularly galaxies in clusters.
B) Galaxies are so closely packed in the universe that they are always interacting with one another.
C) The universe is composed of one giant galaxy of which all observed stars are members; thus the question of interaction between galaxies is irrelevant.
D) Galaxies are so widely separated that they never interact or collide.

Question

Quizplus · Accepted Answer

Galaxies, especially those within clusters, do indeed occasionally collide and interact with each other. This is a well-documented phenomenon in astronomy, contrasting with the other options which either overstate the frequency of interactions, misunderstand the structure of the universe, or incorrectly claim galaxies never interact.

Which of These Statements About Galactic Motions and Interactions Is