Credit: David Mancini/Unsplash
Dark matter physicists may have one of the most frustrating jobs in science. Their work deals with something that must, by almost all models of the universe, exist. But we’ve never found any direct evidence for dark matter. Where other scientists can capture their subjects in a lab and perform experiments on it, scholars of dark matter are left with nothing but a tantalizing set of clues. It’s like studying ghosts—if ghosts were real and also made up a quarter of the matter in the known universe...