The ratio of the universe's actual density to the critical density is:

Name: The ratio of the universe's actual density to the critical density is:
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The ratio of the universe's actual density (ρ) to the critical density (ρc) is given by Ω = ρ/ρc. This is also known as the density parameter or the Omega parameter. If Ω = 1, then the universe is flat and critical, while if Ω < 1, the universe is open and if Ω > 1, the universe is closed. Therefore, option C, Ωₒ, is the best choice.

The Ratio of the Universe's Actual Density to the Critical