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.

A science-oriented advocacy group says the Earth is moving closer to destruction. The Bulletin of the Atomic Scientists said Tuesday that they've moved their “Doomsday Clock” to 89 seconds to midnight,

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