Get ready to duck (again). The Large Hadron Collider, the world’s largest particle accelerator, has now reached an operating temperature of 1.9K–colder than outer space itself, according to Ars Technica.

That means the LHC will soon be ready to begin crashing particles together, after a catastrophic failure and series of repairs over the past year took the accelerator out of commission.

The current prognosis is that the LHC will begin operations sometime in the next five weeks. It will accelerate particles at speeds very close to the speed of light. In effect, they’d run around the 16.7-mile length of the accelerator over 11,000 times per second, the report said. That necessitates the accelerator contain a vacuum that’s an order of magnitude less dense than the moon’s atmosphere. In other words, this is tough stuff, so let’s give those guys a break about that whole catastrophic failure thing. (Image credit: CERN)