Rydberg atom

Okay kiddo, there's a thing called an atom which is like a tiny, tiny world where lots of little, tiny things are moving around. One of those things is called an electron, which can be in different levels of energy or excitement depending on how it moves around the atom.

Now, sometimes when we shine a light on an atom, it can bump up an electron to a higher energy level. But eventually, the electron gets tired of being so energetic and it falls back to its original level, releasing a little bit of energy in the form of light.

A Rydberg atom is a special type of atom where the electron is really, really far away from the center of the atom, almost like it's orbiting around the outside. And when we shine a light on it, the electron jumps up to an energy level that's really, really far away from where it started.

This means that when it falls back down to its starting energy level, it releases a special kind of light that has a really long wavelength, which means it has a really low frequency. This kind of light is called "Rydberg light".

Scientists study Rydberg atoms because they can use them to learn more about how atoms behave and interact with each other. And even though Rydberg atoms are really small, they can help us to understand some really big things, like how the universe works!