At the center of the Milky Way, close to the pull of a supermassive black hole, astronomers have found a strange new radio signal that behaves like a slow, steady clock. This object is more than an ...

A Vulcan Centaur rocket successfully launched two U.S. spy satellites on Feb. 12 despite suffering an anomaly with one of its solid rocket boosters, echoing the result of an October 2024 mission.