Comet Hale Bopp (IMAGE) University of Hawaii at Manoa Caption As comets, like Hale Bopp shown here, pass near the Sun, they release dust that can reach Earth's orbit and settle through the atmosphere where it can be collected. Credit Philipp Salzgeber, CC license (CC BY-SA 2.0) Usage Restrictions Image may be used with appropriate caption and 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.