CALIPSO Satellite Detecting Dust (image) NASA/Goddard Space Flight Center Share Print E-Mail Caption The lidar instrument aboard the CALIPSO satellite 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 NASA Goddard's Scientific Visualization Studio Usage Restrictions None Share Print E-Mail 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.