The brightness of some of these galaxies is not explained by their size or the number of stars they contain, but by the effect of the very active black holes that live inside them. These objects consume huge amounts of the gas in their vicinity, and the friction of this rapidly moving material causes an extraordinary luminosity, making them appear more massive than they really are.
When the scientists eliminated these particularly bright galaxies, the mass estimates for the others fit within the predictions of the standard model of cosmology. The bottom line is that there is no crisis in terms of the standard model of cosmology.
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