Brian Cox gave a wonderful lecture about the universe late last year. I did not know that the Hubble constant= 42 miles/second/3 million light years. He described it this way as a homage to Douglas Adams and the Hitchhikers Guide to the Galaxy. This tells us that the farther away a star or galaxy is, the faster it is moving away from us. So here's the really neat part 1/(Hubble constant)=13.73 million light years which is the age of the universe.