Why are measurements of the present density of the universe important? The overa

Question

Why are measurements of the present density of the universe important?

The overall density of the universe is the main clue that can allow us to tell how quickly the universe is collapsing. The overall density of the universe is the main clue that can allow us to tell where the center of the universe is.     The overall density of the universe is the main clue that can allow us to tell whether the universe is isotropic or homogeneous. The overall density of the universe is the main clue that can allow us to choose between open, closed, and flat models of the universe.

Explanation / Answer

The overall curvature of space time is determined by the average density of matter plus the energy in the universe.

The comparison between the average density and the critical density gives us the shape of the universe.

The measurements of the present density of the universe is important because it tells us the shape of the universe:

if the critical density is more then the universe is closed.

If the critical density is less then the universe is open.

If the critical density is equal then the universe is flat.

It also helps us to determine the age of the universe.

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