Suppose a hypothetical universe is expanding (at some moment in time) at a rate of H. What would the density of this universe need to be (at this same moment in time) in order for it to be spatially flat? Value: H = 80 km s-1 Mpc-1 Give your answer in units of (kg m-3), in scientific notation with one decimal place (two sig figs). Please show work because I have trouble following along

Suppose a hypothetical universe is expanding (at some moment in time) at a rate of H. What would the density of this universe need to be (at this same moment in time) in order for it to be spatially flat? Value: H = 80 km s-1 Mpc-1 Give your answer in units of (kg m-3), in scientific notation with one decimal place (two sig figs). Please show work because I have trouble following along

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Subject: physics