What is the Fate of a Flat Universe?

[chief3233]

Homework Statement

In a non-accelearting Universe, if the density of the Universe is equal to the critical density, then the Universe is

A. open.
B. closed.
C. flat.
D. empty.

Homework Equations

The Attempt at a Solution

I believe the correct answer is flat, but I just wanted to see if anyone else knew? Thanks!

 

[chemisttree]

That's what I would answer too.