Modern physics tells us that the Universe came from a giant explosion about 13.8 billion years ago. The Universe explosion is the evolution of the Universe from a state where it was less than an atom. One dazzling impulse — that indescribably fast and all-encompassing moment of glory — and the singular point became an incomprehensible space of celestial size. That explosion caused the expansion of matter, which is now visible. Galaxies, for example, are clouds that consist of hundreds of billions of stars moving away from each other, pushed by the forces of an initial explosion. Until the Big Bang theory is conclusively proven, each of us can accept or reject it. In any case, get ready for the big explosion of the Universe at the 4^th Vilnius Light Festival.