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Scientists sense breakthroughs in dark-matter mystery

Undated composite image courtesy of NASA shows distribution of dark matter, galaxies, and hot gas in the core of merging galaxy cluster Abell 520, a combination of natural-color image of galaxies and "false-colored" maps showing starlight, hot gas, and daFor decades, the strange substance called dark matter has teased physicists, challenging conventional notions of the cosmos. Today, though, scientists believe that with the help of multi-billion-dollar tools, they are closer than ever to piercing the mystery -- and the first clues may be unveiled just weeks from now.