If you’re ever having a bad day, remember that we could suddenly be blinked out of existence by an advanced alien civilization’s science experiment gone wrong.

That’s according to former Harvard astronomy chair Avi Loeb — notorious for insisting that various space phenomena is evidence of alien life — who wrote in a new Scientific American op-ed that a gigantic, advanced particle accelerator could create a dark energy explosion capable of burning everything in the galaxy at the speed of light. If we want to survive, he says, we’d engage in some interstellar diplomacy as soon as possible.

“One way to avoid a cosmic catastrophe of this type is to establish an interstellar treaty, similar to the Nuclear Test Ban Treaty, signed first in 1963 by the governments of the Soviet Union, the United Kingdom, and the United States,” Loeb wrote.

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