Supernova
Today I felt how an orgasm is like a supernova. Inside reactions are taking place. Things are heating up and pressure builds on the inside. When a balance of forces can no longer be sustained, the core contracts and then releases energy in a big burst.
After the initial burst there is then an afterglow. The core is no longer fusing energy.
Unlike a dead star the human regenerates and rebuilds so that one is able to burst and die again. It's reliving a cosmic wonder on a human scale.