The Milky Way Galaxy has roughly 100 billion stars.  Pretend that
      each one is identical to the Sun.


   Q:  How much energy does the Milky Way emit in one second?

             MW luminosity  =  3.8 x 10^(26) J/s  *  10^(11)

                            =  3.8 x 10^(37) J/s


   Q:  How long would one have to "save" the luminosity of the
         Milky Way Galaxy in order to accumulate as much
         energy as a typical supernova?

                              10^(44) J
             duration  =  ----------------------   =   2.6 x 10^(6) s
                             3.8 x 10^(37) J/s



                       =  about one month