Here is more background on the measurements:

So just how cold are we talking? Scientists use Kelvin as their scale of temperature, and zero Kelvin equates to absolute zero – in other words, the coldest anything can possibly be. It’s the equivalent of -273.15 degrees Celsius (-459.67 degrees Fahrenheit), or about a million times colder than the emptiness of space.

To achieve this, the team from the Massachusetts Institute of Technology (MIT) created a cluster of molecules that reached a low of 500 nanokelvins, which is 500-billionths of a degree above absolute zero. That’s the kind of mind-bogglingly low temperature that a jacket around the shoulders certainly wouldn’t be able to help with. The team used a combination of evaporation and laser technology to cool a sodium potassium gas down to near-zero.

We hope you enjoy the video and keep watching as new experiments get towards almost absolute kelvin!

thanks to science alert for the great write-up