‘We Do Not Understand How A Galaxy With Such Extreme Characteristics Can Exist’A nearly invisible dwarf galaxy is challenging the model of dark matter. Challenge to Current Models: The properties of Nube challenge existing cosmological models, especially those based on the concept of cold dark matter, suggesting that alternative models like fuzzy dark matter might be more accurate. The Nube galaxy. Nube’s discovery poses potential challenges to the prevailing dark matter model. Current cosmological simulations, based on the cold dark matter model, fail to reproduce Nube’s extreme characteristics.