To improve weather forecasts and build better climate models, scientists are looking at changes in soil moisture. Soil moisture is a measurement of the amount of water contained within soil particles. In 2011, NASA and the Argentina space agency launched the Aquarius/SAC-D satellite to observe the salt content of the ocean surface. But researchers also developed a method for the satellite to provide global maps of soil moisture. Orbiting Earth at an altitude of 400 miles, the satellite measures the wetness of soil by detecting microwave energy that's naturally emitted from the top two inches of land. The maps show how severe weather and seasonal cycles affect soil conditions in different parts of the world—information that can be used to help predict the onset of floods or drought. Watch the video to learn more.