Okay kiddo, you know how sometimes you see big fires in the sky at night? Those are called flares, and they happen when gas and energy get released really fast from something like a factory or an oil rig.
Well, a hyder flare is a special kind of flare named after a scientist named Hyder. It happens when the gas and energy get released from a star in space, not from anything on Earth.
Stars are big balls of hot gas in the sky that give off light and heat. Sometimes, when two stars are close to each other, they can steal gas and energy from each other. This can cause one of the stars to suddenly release a lot of gas and energy in a hyder flare!
It's kind of like when you blow up a balloon really fast and then let the air out all at once - a big burst of energy and noise! Scientists study hyder flares to learn more about how stars work and how they interact with each other in space.