soil samples (IMAGE) DOE/Pacific Northwest National Laboratory Caption Soil and its microbes from Prosser, Wash., are heading for the International Space Station, part of an experiment to learn more about microbial behavior in microgravity. Credit Photo by Eddie Pablo III | Pacific Northwest National Laboratory Usage Restrictions No restrictions. License Public Domain 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.