Meteorites up close (IMAGE) University of Tokyo Caption Most asteroid rocks have a complicated metamorphic history. Researchers view samples under powerful microscopes to study this history. Credit © Sano et al. Usage Restrictions © Sano et al. 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.