Strontium Atomic Clock (IMAGE) University of Copenhagen Caption This is a strontium atomic clock operating at JILA, University of Colorado. Laser light is used to cool and manipulate the atoms for optimal operation of the clock. Carefully designed magnetic field coils compensate for the Earth magnetic field. Credit University of Colorado Usage Restrictions Credit: University of Colorado License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.