A galaxy is a collection of stars connected by gravity. It is estimated that there may be as many as 100 billion galaxies in the universe. You can also see one of them at the Vilnius Light Festival. It consists of interstellar gas, dust and a dark system of matter, and is complemented by a musical sound. All of these elements are important in their own way and consist of a single puzzle that makes you feel like you are in the vastness of space.