There's a new twist in the hunt for dark matter, the invisible substance that makes up 85 percent of all the mass in the unknown universe: it may actually be lighter. In a study published in the journal Physical Review Letters, a team of researchers propose a new form of the hypothetical substance that's lower in mass compared to other dark matter candidates, which could explain a mysterious phenomenon at the galactic center, in a region called the Central Molecular Zone (CMZ). "At the center of our galaxy sit huge clouds of positively charged hydrogen, a mystery to scientists for […]

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