A supernova (plural supernovae) is a stellar explosion which produces an extremely bright object made of plasma that declines to invisibility over weeks or months. … In either type of supernova, the resulting explosion expels much or all of the stellar material with great force.

How does stellar explosion happen?

It’s a balance of gravity pushing in on the star and heat and pressure pushing outward from the star’s core. When a massive star runs out of fuel, it cools off. This causes the pressure to drop. … The collapse happens so quickly that it creates enormous shock waves that cause the outer part of the star to explode!

What happens when a star blows up?

CAITY: So the core of a star collapses when the rest of it is exploding outward. So that core will continue to collapse under its own gravity and it can form one of two objects. It can become something called a neutron star or it can form into a black hole.