Apollo 17 Astronaut (IMAGE) Field Museum Caption Apollo 17 astronaut and geologist Harrison Schmitt in 1972 collecting samples of lunar soil that would later be used in this study. Credit NASA Usage Restrictions Please credit to NASA 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.