Hello Astro community, I really need help with few assignments!! First one would be about Supernova: In a distant galaxy a supernova flash occured. When supernova reached luminosity maximum, galaxy apparent magnitude was 17,6. Before the supernova flash the galaxy apparent magnitude was 18,0. What was the supernova's apparent magnitude at it's luminosity maximum? Could you help me solve this and explain it to me ? Karma !