A new study deepened the mystery of dark matter, as finding the dark matter in galaxies is spread out smoothly, according to media reports. The study was published Monday in the American scientific journal Astrophysical. Having analyzed the observations of two dwarf galaxies, Fornax and Sculptor, researchers from the Harvard-Smithsonian Center for Astrophysics found that there was no higher concentration in the center of the galaxy than anywhere else. The finding goes completely against the current cosmological models, which suggest that dark matter should be clustered at the centers of galaxies. \"After completing this study, we know less about dark matter than we did before. Our measurements contradict a basic prediction about the structure of cold dark matter in dwarf galaxies,\" said Matt Walker, the study\'s lead author. According to the current cosmological models, dark matter almost certainly exists, otherwise, galaxy clusters would have no sufficient gravity to hold themselves together. Scientists hoped the study on dwarf galaxies could make some breakthrough in dark matter hunting, because calculations suggest dwarf galaxies consisted of 99 percent dark matter. However, the new study has disappointed the researchers, as it has \"drawn a big, frustrating blank\", Dr. Alastair Wilkins from University of Bristol in Britain remarked in his blog.