CALIPSO Satellite Paths (IMAGE) University of Maryland Caption As the CALIPSO satellite traces a path across the Atlantic, its lidar instrument sends out pulses of light that bounce off particles in the atmosphere and back to the satellite. It distinguishes dust from other particles based on optical properties. Credit Conceptual Image Lab, NASA/Goddard Space Flight Center 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.