Doctorate in Astrophysics is impressive as is his gui6playing.. knighthood not so much.
We have the Presidential medals of Honor and of Freedom, etc. Orders of knighthood recognize contributions to the nation. Certainly his rock group has generated a lot of tax dollars and has created jobs, and will go on generating royalites for some time to come. Knighthoods and damehoods are also given to scientific, medical, religious, business and charitable figures.