1. Pegasus II has a radial velocity of 12 800 km/s. What is this in units of ‘c’? 2. The Coma…

1. Pegasus II has a radial velocity of 12 800 km/s. What is this in units of ‘c’? 2. The Coma cluster is 60 Mpc away from us and has a recession speed of 6600 km/s. Calculate the Hubble constant for this galaxy. 3. Some early estimates of the Hubble Constant put it at 50 km/s/Mpc. (a) Would this make the universe older or younger than if a value of 75 km/s/Mpc was used? (b) What would the age of the universe be if H0 was 50 km/s/Mpc? 4. Calculate the wavelength of maximum radiation emitted by the red star Barnard’s Star, which has a temperature of 3090 K.  

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