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Question
(a) What Hubble constant corresponds to an approximate age of the universe of $10^{10} \textrm{ y}$? To get an approximate value, assume the expansion rate is constant and calculate the speed at which two galaxies must move apart to be separated by 1 Mly (present average galactic separation) in a time of $10^{10} \textrm{ y}$ (b) Similarly, what Hubble constant corresponds to a universe approximately $2\times 10^{10} \textrm{ y}$ old?
1. $30.0\textrm{ km/s}\cdot\textrm{Mly}$
2. $15.0 \textrm{ km/s}\cdot\textrm{Mly}$
Solution Video