The fifth panel in the Eppur si muove scientific panel series is dedicated to cosmology. Cosmology, which began with the Big Bang, formulated by Georges Lemaître, a Belgian priest, theoretical physicist and cosmologist from the Catholic University of Louvain, still attracts attention today with its progress and future challenges. Three cosmologists and astroparticle physicists will present modern cosmology in a clear way, with an emphasis on the Big Bang, the beginning of space and time, and the emergence of elementary particles and the first structures from which stars emerge. The origin of the Universe as a quantum phenomenon and the question: what is time? will be discussed, then the ineffable inflation of the Universe from "Nothing" into existence, the emergence of the first elements, dark matter, dark energy, the mystery of the accelerated expansion of the Universe, primordial black holes, observational traces of the Big Bang, measurements by the PLANCK satellite, the recent discovery of gravitational waves as the final confirmation of Einstein's general theory of relativity (the law of gravity), and the mysterious observations of the Axis of Evil. Editor and manager: Dr. sc. Branko Guberina, scientific advisor of the RBI (retired). He received his doctorate from the University of Zagreb in 1979. He has worked as a research scientist at the Max-Planck-Institut für Physik and Astrophysik, Munich, Institut für Theoretische Physik, ETH, Laboratoire de Physique Théorique et Hautes Energies, Université de Paris XI, Centre de Physique Théorique, CNRS, Marseille, Sektion Physik, Ludwig-Maximilians-Universität, Munich; DESY, Hamburg, and as Visiting Professor, Dept.of Phys., University of California UCLA, Los Angeles. Professional interests: Theoretical physics of elementary particles, quantum field theory, gravitation and cosmology, especially the study of the cosmological constant and dark energy using the renormalization group. He received the State Award of the Republic of Croatia for Science in 1994. In 1997, he was awarded the Order of Danica Hrvatska with the figure of Ruđer Bošković for special merits in science. He is a member of the National Scientific Council of the Republic of Croatia (1998-2003), president of the Croatian Physical Society (1997-2000), member and treasurer (2005-2006) and president (2007-2008) of the Croatian Association of the Club of Rome. Participants: Dr. sc. Nevenko Bilić is a retired scientific advisor of the Ruđer Bošković Institute. He is a scholarship holder of the Heinrich-Hertz Foundation at the Fakultät für Physik, Universität Bielefeld. On several occasions, he stays as a visiting scientist and visiting professor at Universität Bielefeld, Universität Hanover, University of Cape Town, and University of Juiz de Fora, Brazil. He deals with theoretical physics of elementary particles, quantum field theory, particle astrophysics, gravitation and cosmology. He was a member of the National Science Council and a member of the Scientific Project Evaluation Group of the Science Foundation of Ireland. He is a member of the Croatian Association of the Club of Rome, of which he was the president from 2013 to 2015. He is the recipient of the State Award for Science for 2010. Dr. sc. Vibor Jelić, astrophysicist from the Department of Experimental Physics of the Ruđer Bošković Institute in Zagreb. He received his doctorate in 2010 from the University of Groningen, the Netherlands, and spent five years on postgraduate training at the Netherlands Institute for Radio Astronomy - ASTRON and the University of Groningen. He is engaged in experimental cosmology and radio astronomy. He is a member of the international collaborations LOFAR and SKA. Organizer of the scientific forum program: Libraries of the City of Zagreb, City Library. Editor of the forum cycle Ismena Meić. The forum was held on Wednesday, September 27, 2017 at 7 p.m. in the Kupola Gallery of the City Library.