Question

two pieces of evidence that support the theory that the universe is expanding are... a. the red shift of light from distant stars and the existence of nuclear fusion. b. the red shift of light from distant stars and the existence of cosmic background radia c. the blue shift of light from distant stars and the existence of nuclear fusion. d. the blue shift of light from distant stars and the existence of cosmic background.

Explanation:

The red - shift of light from distant stars indicates that the stars are moving away from us, which is evidence of the universe expanding. Cosmic background radiation is a remnant of the early universe and supports the Big - Bang theory which is related to the expanding universe concept. Nuclear fusion is a process occurring in stars and is not direct evidence for the universe's expansion. Blue - shift indicates an object is moving towards us, which is contrary to the idea of an expanding universe.

Answer:

B. The red shift of light from distant stars and the existence of cosmic background radiation