The NASA-ISRO Synthetic Aperture Radar (NISAR) satellite achieved a major milestone with the successful deployment of its 39-foot (12-meter) radar antenna reflector on August 15, 2025. Launched from the Satish Dhawan Space Centre in Sriharikota, India, NISAR represents the first joint Earth-observing mission between NASA and ISRO. The mission’s primary focus is to use advanced dual-frequency L-band and S-band radar systems to monitor Earth’s surface changes, track disturbances from natural disasters such as earthquakes and landslides, and analyze crop and forest health. The main radar instrument, built with a 39-foot deployable reflector, operates in both L-band (NASA) and S-band (ISRO), providing unprecedented high-resolution, all-weather day-and-night imaging. NISAR will orbit the planet every 12 days, generating detailed maps to support disaster response, environmental management, and climate research. The successful deployment this week underscores the progress in U.S.-India space collaboration and the satellite’s anticipated scientific impact.