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.

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

Called the coming microwave background the  weak radiation fills the universe more or less uniformly. This radiation is the fossil remnants of the postulated big band at the beginning of the universe. The photos produced at the time continue to travel through the universe growing fainter over time and have fallen in the microwave range of the electromagnetic spectrum now.

beta decay is the answer