NASA scientists are interested in learning how clouds affect our atmosphere, particularly because clouds play a role in affecting Earth's overall temperature and energy balance. The space agency's Students' Cloud Observations Online (S'COOL) Project involves students (ages 5-20+) in real science, making and reporting ground truth observations of clouds to assist in the validation of NASA's CERES (Clouds and the Earth's Radiant Energy System) satellite instruments.

Citizen scientists participating in S'COOL 1) obtain satellite overpass schedules, 2) observe and report clouds within +/-15 minutes of the satellite's passage, 3) compare and classify the agreement between the ground and satellite views.

Participation is available either as a classroom project or individually. Citizen scientist observations help NASA validate satellite data and give the space agency a more complete picture of clouds in the atmosphere and their interactions with other parts of the integrated global Earth system. Observations are sent to NASA for comparison to similar information obtained from satellites. Reports from a wide range of locations are helpful to assess the satellite data under different conditions.