What characteristic of the universe governs whether the universe is open,closed,or flat?

Question

Quizplus · Accepted Answer

The characteristic of the universe that governs whether it is open, closed, or flat is its density. If the density of the universe is less than a certain critical value, it will be open and continue to expand forever. If the density is greater than the critical value, it will be closed and eventually collapse back on itself. If the density is exactly equal to the critical value, then it will be flat and will also continue to expand forever at a decreasing rate.

What Characteristic of the Universe Governs Whether the Universe Is