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Our knowledge of the Universe is based mainly on observations of what shines in it - primarily stars and their huge clusters, or galaxies. It is largely from observations of galaxies that we draw conclusions about the evolution and nature of the Universe. We know very different galaxies - large and small, spiral and elliptical, star-forming and long extinct. Is there a category of galaxies that has escaped observation? During the lecture, Prof. Agnieszka Pollo will talk about galaxies with low surface brightness, i.e. galaxies that shine so faintly that they are almost impossible to see. The first such galaxy was discovered in the 1980s, and we are currently detecting more and more of them. In seemingly empty areas of the sky, there are hidden galaxies that are almost invisible even to the best telescopes. How many are there? What can they tell us about the history of galaxy formation, the properties of the Universe and the matter that fills it? The great sky surveys coming up in the next decade will help us answer these questions, but the era of new discoveries begins today. Prof. Agnieszka Pollo is an astrophysicist, she deals with observational cosmology, studies of the large-scale structure of the Universe and the evolution of galaxies. She works at the Astronomical Observatory of the Jagiellonian University, she is also the deputy director of the National Center for Nuclear Research. The material was created thanks to funding from the Strategic Program Initiative of Excellence at the Jagiellonian University.