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Gravity is the eminence grise of the Universe. It is thanks to it that all cosmic structures are created. Have you ever wondered how the Earth would behave if the Sun suddenly evaporated? Or what would fall faster in a vacuum - a feather or a stone? Dr. Maciej Mulak from the Faculty of Fundamental Problems of Technology explains what forces govern the Cosmos and whether it is possible to calculate how much our planet really weighs. Prepare yourselves for an easily digestible portion of important physical formulas.