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ρc is Critical density, the value at which the Universe is at balance, and expansion is stopped, and it's equation is: "3H0^2/8πG", estimated as (1~3)×10^-26 kg/m³; ħ is reduced Planck constant, and it's value is 1.054571817×10^−34 joule seconds; and 93Gly is diameter of Observable universe, it's about 28.5 gigaparsecs (93 billion light-years or 8.8×10^26 m).
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