Starquakes in stars from cluster M67 reveal hidden pauses that mark major internal changes. These pauses improve how we estimate star ages.

Also back at Studio 8H for their eighth appearance was musical guest Coldplay, who performed music from their latest album, Moon Music, which was released the day before. Special Guests ...

Trump Weakens U.S. Cyberdefenses at a Moment of Rising Danger The firing of the head of the N.S.A. was only the latest move to erode fortifications against cyberattacks, especially those targeting ...