Quantity Symbol relative density (value) Hubble constant (km/s/Mpc) Ho 70 Matter density (no units) 0m Radiation density (no units) 0 Dark-energy density (no units) 0.25 insion History of the Universe (1) Record the age of the universe, to (in billions of years), from this trial. billion years (in) Now set the dark-energy density parameter , to 0.5, and then press Plot now and record the new values for to (in billions of years). billion years ful how set the dark-mergy density parameter , to 0.75, and then press Plot new and record the new value for f. (in Billions of years) billion years (w] Do any of these three ages give the universe enough time to make 12-billion-year-old star clusters? O NO (w] Which one of the following statements best describes the relationship between the dark energy and the universe's age