Microbiome Swab Kit (IMAGE) NASA/Johnson Space Center Caption A section of the Microbiome swab kit containing Microbiome samples from various physical surfaces is shown prior to being stowed for return to Earth. The Microbiome experiment studied the impact of space travel on both the human immune system and an individual's microbiome (the collection of microbes that live in and on the human body at any given time). Credit NASA 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.