Q:  What is the change in GPE during this collapse?


           The change in GPE turns out to be very nearly equal
           to the GPE of the final, sun-sized configuration.


                delta GPE  =  -2.3 x 10^(41)  J



  Q:  Divide the released GPE by the freefall timescale to estimate
            a very rough "freefall luminosity".


                          2.3 x 10^(41) J
                L_ff  =  ----------------  =  1.4 x 10^(28)  J/s
                          1.6 x 10^(13) s


                                           =  38  solar luminosities

            This is a very large power!