Question

what is supernova explosion

Answer 1

When a large star blasts, a lot of light and heat energy is produced. This is known as supernova.

Answer 2

♦️♦️♦️♦️♦️♦️♦️♦️♦️♦️♦️♦️♦️♦️
As the stars run out of nuclear fuel like an automobile,so gradually some of its masses flows into its core(middle/central-most part).
♦️♦️♦️♦️♦️♦️♦️♦️♦️♦️♦️♦️♦️♦️
Having too muchmatter causes the star to explode, resulting in a supernova. 
♦️♦️♦️♦️♦️♦️♦️♦️♦️♦️♦️♦️♦️♦️