The ghostly matter co-evolved with regular matter that makes up the visible universe.

Deep-sea researchers have launched a groundbreaking project to investigate "dark oxygen"—a form of oxygen produced in total darkness on the ocean floor. The initiative follows last year's discovery of ...

"Understanding dark energy and its impact on our Universe is one of the biggest challenges in cosmology," said Dr. Daniele Sorini, lead researcher. "Surprisingly, we found that even significantly ...