The Doomsday Clock is now at 89 seconds to midnight and we’ve never been closer to annihilation. Here’s everything you need to know about the recent announcement, the origins of the clock, and its presence in pop culture.

The clock had stood at 90 seconds to midnight for the past two years and “when you are at this precipice, the one thing you don’t want to do is take a step forward,” said Daniel Holz, chair of the group’s science and security board.

The Doomsday Clock, a concept designed by the Bulletin of the Atomic Scientists to represent humanity’s proximity to a global catastrophe, was updated on Tuesday.