Sensor (IMAGE) University of Copenhagen - Niels Bohr Institute Caption The newly developed sensor that can measure the ultra-small magnetic fields is comprised of a cloud of billions of cesium gas atoms in a tiny glass tube. Using laser light, the tilts of all of the atoms are turned in the same direction. Credit (Credit: Kasper Jensen, Niels Bohr Institute) Usage Restrictions (Credit: Kasper Jensen, Niels Bohr Institute) 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.