Astronomers create most accurate map yet of all the matter in the universe
Of all the questions facing astronomers today, some of the biggest unknowns are about the stuff that makes up most of the universe. We know that the ordinary matter we see all around us makes upjust 5% of all that exists, while the rest is made up of dark matter and dark energy. But because dark matter doesn’t interact with light, it is extremely hard to study — we have to infer its existence and position from looking at the way it interacts with the ordinary matter around it....