How the Moon Formed From a Synestia (IMAGE) University of California - Davis Caption This artist's rendering shows the hot, molten Moon emerging from a synestia, a giant spinning donut of vaporized rock that formed when planet-sized objects collided. The synestia is in the process of condensing to form the Earth. This new model for the Moon's origin answers outstanding questions about how the Moon's composition compares to that of Earth. Credit Image by Sarah Stewart/UC Davis based on NASA rendering. Usage Restrictions May be used with acknowledgement. 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.