11.6 Exercise 11

(a) Calculate the approximate age of the universe from the average value of the Hubble constant, $H_{0} = 20 \text{km}/\text{s} \cdot \text{Mly}$. To do this, calculate the time it would take to travel 0.307 Mpc at a constant expansion rate of 20 km/s. (b) If somehow acceleration occurs, would the actual age of the universe be greater or less than that found here? Explain.