Celestial rings are a type of astronomical phenomenon that can be seen around certain planets and moons. They are composed of small particles of dust, ice, and gas that orbit the planet or moon in a ring-like shape. The most famous example of celestial rings is Saturn's rings, which are composed of chunks of ice and rock. Coronas are a type of celestial ring that are composed of gas and dust particles that form a halo around a planet or moon.