$3)$ We can do a calculation to come up with a rough estimate of why super novae can be so bright. For type II $($massive star$)$ supernovae, the energy comes from gravitational potential energy in the sudden collapse from a white dwarf to a neutron star. You can estimate how much energy is avail able from this collapse by using the gravitational potential energy equation. The energy comes out over a time frame of about a month. From this you can calculate the luminosity in Watts. In reality only about $1\%$ or less of the energy comes out as light$$nearly all of the energy actually comes out in neutrinos. Assuming this $1\%,$ how many Suns would be equivalent to the supernova luminosity? $(6$ pts$)$