Supernova-Interesting facts. Term supernova refers to explosive death of some massive star characterized by an enormous amount of emitted energy.Supernova explosion emits incredible amount of energy-more energy that our Sun emits for its entire lifetime.he astronomers believe that supernova explosion occurs approximately twice every 100 years in our galaxy. This means that supernova explosion are relatively rare event within our Milky Way galaxy. Most galaxies have a supernova every 25 to 100 years.