Electron in an Atom (IMAGE) U.S. National Science Foundation Caption In this artist's representation, an electron orbits an atom's nucleus, spinning about its axis as a cloud of other subatomic particles are constantly emitted and reabsorbed. Some theories in particle physics predict particles, as yet undetected, that would cause the cloud to appear very slightly pear-shaped when seen from a distance. With the support of the National Science Foundation, ACME researchers created an experimental setup look at that shape with extreme precision. To the limits of their experiment, they saw a perfectly round sphere, implying that certain types of new particles, if they exist at all, have properties different from those theorists expected. Credit Nicolle R. Fuller, NSF Usage Restrictions None 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.