The Doomsday Clock is the closest it has ever been to midnight, after it was officially reset by the Bulletin of the Atomic Scientists’ Science and Security Board (SASB) on Tuesday. The clock represents how close the world is to ending — or to a major global disaster.

The new Doomsday Clock time has been set by the Bulletin of the Atomic Scientists. Here’s what it means.

USA TODAY asked Alexandra Bell, the president and CEO of the Bulletin of the Atomic Scientists, a few questions about the Doomsday Clock.

Experts have warned that the world is the closest it has ever been to disaster.