Temperatures colder than space achieved here on Earth using superconducting X-ray laser

A particle accelerator that slams electrons together here on Earth has achieved temperatures colder than those of outer space.

Using the X-ray free-electron laser at the Department of Energy's SLAC National Accelerator Laboratory — part of an upgrade project to the Linac Coherent Light Source , called LCLS II — scientists chilled liquid helium to minus 456 degrees Fahrenheit , or 2 kelvins . That is just 2 kelvins above absolute zero, the…

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