Bennu spitting out pebbles (IMAGE) Field Museum Caption Pebbles ejected off the surface of asteroid Bennu were observed frequently by NASA’s OSIRIS-REx spacecraft. This observation inspired this study. Credit NASA/Goddard/University of Arizona/Lockheed Martin. Usage Restrictions No restrictions. License Public Domain 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.