OSIRIS-REx sample collection (IMAGE) Southwest Research Institute Caption An SwRI-led study found that the surface regolith of the asteroid Bennu is primarily loose rubble. Images taken before and after the touch-and-go sample collection indicate surface disturbances up to 15 inches away. Credit NASA/Goddard/University of Arizona 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.