What do satellites detect to get data?

Satellites detect various forms of electromagnetic radiation, including visible light, infrared, and microwave signals, to gather data about the Earth's surface and atmosphere. They use sensors and imaging technology to capture information on temperature, vegetation, cloud cover, and land use. Additionally, satellites can measure gravitational and magnetic fields and monitor changes in these parameters over time. This data is crucial for applications in weather forecasting, environmental monitoring, and disaster management.