The Doomsday Clock now stands at 89 seconds to midnight, the closest to catastrophe in its nearly eight-decade history. Here's a look at how — and why — it's moved.

When was the Doomsday Clock farthest from midnight? In 1991, with the end of the Cold War, the United States and the Soviet Union signed the Strategic Arms Reduction Treaty, the first treaty to ...

On Tuesday morning, the Doomsday Clock was set at 89 seconds to midnight, which is the closest it has ever been to midnight in the 78 years since it started running.

The clock was its farthest from midnight — a sizable 17 minutes — in 1991, with the end of the Cold War and the signing of the Strategic Arms Reduction Treaty between the U.S. and Soviet Union.

The clock was its farthest from midnight — a sizable 17 minutes — in 1991, with the end of the Cold War and the signing of the Strategic Arms Reduction Treaty between the U.S. and Soviet Union. The ...