Why does it all exist? Stars, galaxies, the earth, mankind? This is what Hiranya Peiris, professor at Stockholm University, wants to find out. By studies of the properties of the primordial ripples that was formed at the Big Bang, the physics that went on at and just after the bang can be revealed and explain the origin of all the structures in the universe since the birth of universe. There is some work left to do. Today, scientists know what it looked like 380,000 years after the Big Bang.