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.

The Bulletin of Atomic Scientists announced Tuesday that the "Doomsday Clock" is now set to 89 seconds to midnight.

Today, the Doomsday Clock was set to 89 seconds to midnight, signaling that experts fear we are dangerously close to a global catastrophe.