What is connecting the planet Mercury with X-ray lasers? The ability to create low-energy coherent X-rays is a revolution in communication and observation technology. The ability to manipulate wave movement at the quantum level is one of the most fundamental things in physics. The ability to make highly accurate, coherent X-rays makes it possible to create new types of X-ray microscopes with extremely high accuracy. Those X-ray microscopes can do fundamental things in research. And those X-rays can be used as the next-generation laser communication systems. X-ray-based laser communication is one of the most secure communication systems we can imagine. Ring-shaped X-ray structures can make it possible to create a new type of laser-communication system with X-ray frequency. ESA/JAXA's BepiColombos probe discovered X-ray auroras at the poles of the planet Mercury. The reason that small planet has those X-ray auroras is the electron rain from the Sun. This phenomenon can be used to cre...