Check out today's astronomy picture of the day, featuring a numerical relativity visualization made by some folks i… https://t.co/Y4dMYs4LYp
Violently exploding stars which shine very brightly for days or weeks. They occur when the fuel for nuclear reactions is used up, and a star cools. Gravity pulls all the matter down toward the star's center. If this happens quickly, nuclear reactions may suddenly begin again, detonating the star in a nuclear explosion.