ISRO announced that the NISAR mission has entered its science phase. NISAR is a joint NASA-ISRO Synthetic Aperture Radar mission launched in July 2025. For exam preparation, the development links India-US space cooperation, Earth-observation technology and remote sensing applications. NASA lists NISAR as an active mission and states that its objective is to measure and understand changes in Earth’s land, ice, water and vegetation. This makes it more than a space-news item: it is also an example of data-based decision-making in environment, geography, disaster management, agricultural monitoring and infrastructure monitoring.
The main technical feature of NISAR is dual-frequency radar. ISRO describes the imaging payload as L-band and S-band Synthetic Aperture Radar. NASA also lists L-band and S-band radar instruments for the mission. This technology supports high-quality data on ecosystems, ice masses, vegetation and ground-surface changes. NASA's Jet Propulsion Laboratory states that NISAR’s two radars will monitor nearly all of Earth’s land- and ice-covered surfaces twice every 12 days. Radar-based observation reduces the limits created by clouds, darkness and weather, which is a key point that separates it from ordinary optical imaging in exam questions.
For RAS and UPSC, NISAR connects static GK with current affairs. In prelims, likely areas include the NASA-ISRO partnership, Synthetic Aperture Radar, L-band and S-band instruments, Earth-observation satellites, and study of land, ice and vegetation. In mains, it can be used as an example of science and technology in climate studies, natural-resource management, agricultural monitoring, infrastructure monitoring and disaster response. The science phase means the mission has moved beyond launch and commissioning toward regular scientific observations and data use.