There are two primary models of the universe. One is the expanding model, which says that the universe is Constantly increasing in size. The other is, the steady state model, which says that the universe is approximately Constant in size and shape. What evidence would you expect to see if the expanding model were correct?

One is the expanding model, which says that the universe is Constantly increasing in size.

Explanation:

I believe its that

In a short way, if an object is moving away, the light that comes from that object will have a red shift (it seems a little more reddish than it actually is)

If the object is moving towards us, the light that comes from the object will have a blue shift (it seems a little more blueish than it actually is)

Those shifts can be observed from the Earth, so from that is safe to conclude that the expanding model is actually correct.

Explanation:

it takes hundreds of years to become stable.

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