Gamma-Ray Burst (GRB)
Imagine you're on a camping trip with your friends in the middle of nowhere. You set up your tent near a vast, dark sky. Suddenly, one night, you hear an incredibly loud, piercing whistle that sounds like nothing you've ever heard before.
Technical definition
A massive explosion that occurs when a big cosmic object, such as a star, reaches the end of its life and releases a huge amount of energy in the form of light and radiation.