CATS on ISS (IMAGE) NASA/Johnson Space Center Caption The Cloud-Aerosol Transport System (CATS) will measure clouds and aerosols in the Earth's atmosphere. It will be mounted externally on the International Space Station. 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.