If astronomers were in charge of a lost-and-found department, they would have been fired long ago. Most have come to terms with the notion that at least 90 percent of the matter in the universe must consist of some strange, dark material that they cannot directly detect. More embarrassingly, astronomers had lost track of most of the baryons—ordinary, visible matter made of protons, electrons, and neutrons.
Log in
Subscribers, enter your e-mail address for full access to the Science News archives and digital editions.