Meteor showers are a natural phenomenon that occur when the Earth passes through a stream of debris left behind by a comet or asteroid. The debris, which is made up of small particles, enters the Earth's atmosphere and burns up, creating a spectacular display of shooting stars. Planetaria are structures that are designed to replicate the night sky, often with the use of projectors and other technologies. They are used to educate people about astronomy and the night sky, and can also be used to simulate meteor showers.