A Self-Excited Dust Density Wave (IMAGE) American Institute of Physics Caption 400 kilometers above Earth, researchers examined waves in complex plasma under microgravity conditions and found that the microparticles behaved in nonuniform ways in the presence of varying electrical fields. They report some of the first findings from the Plasma-Kristall 4 experiment, a collaboration between the European Space Agency and the Russian State Space Corporation Roscosmos, in Physics of Plasmas. This image shows a self-excited dust density wave. Credit Jaiswal et al. Usage Restrictions This image may be used only with appropriate credit. 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.