Landsat is a series of Earth-observing satellites that provide detailed images of the planet's surface. Launched by NASA in 1972, these satellites capture data in various wavelengths, allowing scientists to monitor changes in land use, vegetation, and natural resources over time. The Landsat program has been instrumental in environmental research, agriculture, and urban planning. By offering consistent and long-term data, it helps researchers understand the impacts of climate change and human activities on the Earth's ecosystems.