Bimodal Size Distribution of Particles (IMAGE) Moscow Institute of Physics and Technology Caption Bimodal size distribution of particles. Particles with radii of about 0.025 micrometers have clearer peaks compared to particles with 0.4-micrometer radii. Credit Credit: Dmitry Shaposhnikov et al./<em>Journal of Geophysical Research: Planets</em> 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.