Here's what to know about the messaging app used by Trump Administration officials to discuss military strikes on Yemen.

Since its discovery in 1977, the Wow! Signal has puzzled radio astronomers. The Ohio State University Big Ear radio telescope found this powerful 72-second narrowband radio signal. The signal was ...

LONDON (AP) — A magazine journalist’s account of being added to a group chat of U.S. national security officials coordinating plans for airstrikes has raised questions about how highly sensitive ...

The Pentagon’s latest report makes one thing clear: Signal protects conversations, but it was never designed to safeguard U.S. war plans — and using it that way carried real risk for American forces.

Meredith Whittaker remembers exactly where she was when she read the story that would spark the first major crisis of the second Trump Administration—the debacle that became known as Signal-gate. The ...