Saturdays, for most people at the University of Arizona football stadium, focus on tailgating and touchdowns. But for some, the focus is on making the world’s largest and most advanced...

Usually when people observe hot gas coming out of something, they are watching a politician deliver a speech. Astronomers have found objects that do the same thing but in a far more spectacular fashion. Quasars...

At 1 a.m., Paul Smith might be the only one playing Bach’s Brandenburg Concerto No. 1 at nearly full volume on Mount Lemmon.The piece has a happier tone than the 19th-century Russian and German composers...