ISRO announced that NISAR, launched in July 2025, had entered the science phase of its mission. NISAR stands for NASA-ISRO Synthetic Aperture Radar and is a joint Earth-observation mission of NASA and ISRO. For exam preparation, the update links space technology, remote sensing, environmental monitoring and India-US scientific cooperation.
The core feature of NISAR is its dual-frequency radar capability. It carries L-band and S-band synthetic aperture radars. This enables the mission to provide data on Earth's ecosystems, ice-covered regions, vegetation and ground-surface changes. ISRO also lists applications in agriculture, forestry, hydrology, Himalayan ice and geo-sciences. Such data is relevant to disaster risk, water resources, land use and climate-related studies.
The mission was launched on GSLV-F16 on 30 July 2025. After launch, its 12-metre antenna reflector was successfully deployed. Entry into the science phase means the satellite has reached the stage for its main scientific work. Early S-band imaging covered the Indian landmass and calibration-validation sites; an initial Godavari delta image showed agricultural fields, mangroves and aquaculture fields clearly.
The static-GK linkage is with remote sensing, synthetic aperture radar, Earth-observation satellites, satellite orbits and environmental monitoring. In prelims, questions may focus on mission partners, radar bands, the launch vehicle and application areas. In mains, NISAR can be used as an example for civilian uses of space technology, environmental monitoring, agriculture and water management, and monitoring of Himalayan ice or land deformation.