Question

which statement accurately describes the origin and expansion of the universe? as the universe continues to expand, it gradually gets warmer. galaxies that are farther away are moving away more slowly. cosmic background radiation is leftover thermal energy from the big bang. stars and galaxies formed almost immediately after the big bang occurred.

Explanation:

• As the universe expands, it cools, not warms. So the first option is wrong.
• Galaxies farther away are moving away faster (Hubble's law), so the second option is wrong.
• Cosmic background radiation is indeed leftover thermal energy from the Big Bang.
• Stars and galaxies formed billions of years after the Big Bang, not immediately. So the fourth option is wrong.

Answer:

Cosmic background radiation is leftover thermal energy from the big bang.