Rubidium atoms used to record coldest temperature — ever
Atomic gas cooled to 0.00000000005 degrees Celsius above absolute zero
![concentration of rubidium atoms](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/04/ag_kasevichlensing_image.jpg?fit=840%2C460&ssl=1)
CLUMPED AND COLD Stanford University physicists used images like this one, which depicts the concentration of rubidium atoms, to determine that they had cooled the atoms to a record-low temperature.
T. Kovachy et al/Physical Review Letters 2015