Researchers said this feat concludes “one of the major challenges in modern cosmology.”
First, a clarification. We haven’t found dark matter or dark energy, which together are thought to make up about 98% of the universe. In fact, according to Neil deGrasse Tyson, we shouldn’t even call it dark matter, because we don’t know that it is in fact matter, or even what it is. He suggests we use the term dark gravity.