An Ancient Channel Formed (IMAGE) NASA/Goddard Space Flight Center Caption An ancient channel formed as massive eruptions of very fluid lava poured across the surface of the moon. The Apollo 15 astronauts landed on the edge of a Hadley Rille. Credit NASA/Goddard/Arizona State University Usage Restrictions None 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.