A team of astronomers say they may have detected dark matter, the invisible substance thought to make up over 85 percent of all matter in the universe, for the first time in history. “This could be a crucial breakthrough in unraveling the nature of dark matter,” study author Tomonori Totani, an astronomer at the University of Tokyo, told The Guardian. Dark matter, outnumbering ordinary matter five-to-one, was to hypothesized to explain this discrepancy. That, of course, makes its existence extremely difficult to demonstrate, and what dark matter actually is remains a mystery, even though it’s a cornerstone of modern cosmology. “It turns out that dark matter is a new particle not included in the current standard model of particle physics,” Totani added.