Microbial biofilm (IMAGE) NASA/Johnson Space Center Caption A microbial biofilm growing on basalt rock. Credit Rosa Santomartino, UK Centre for Astrobiology/University of Edinburgh 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.