Question

which sentence about galaxies provides evidence of universe expansion that supports the big bang theory? (1 point)
galaxies are moving more slowly than they have in the past.
galaxies are moving away from each other.
galaxies are in constant motion.
galaxies are moving at different speeds and in different directions.

Explanation:

To determine the correct answer, we analyze each option:

• "Galaxies are moving more slowly than they have in the past": There's no evidence or theory supporting this as evidence for Big Bang - related universe expansion.
• "Galaxies are moving away from each other": The Big Bang Theory proposes that the universe is expanding, and a key piece of evidence is the observation that galaxies are receding from one another (Hubble's law - related observations).
• "Galaxies are in constant motion": Just being in motion doesn't specifically support the expansion of the universe as per Big Bang Theory.
• "Galaxies are moving at different speeds and in different directions": This is a general statement about galaxy motion and doesn't directly support the idea of universe expansion from the Big Bang.

Answer:

B. Galaxies are moving away from each other.