Fill in the Blanks:
NISAR maps the global surface every ________.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 12 days.
NISAR (NASA-ISRO Synthetic Aperture Radar) is a joint Earth-observing mission between NASA and ISRO. It is designed to map the entire globe's land and ice surfaces with unprecedented precision every 12 days. By using dual-frequency radar (L-band and S-band), it can penetrate clouds and darkness to monitor minute changes in Earth's crust, such as glacier melt, forest biomass, and natural hazards like earthquakes or landslides. This high-frequency temporal resolution allows scientists to track environmental changes in near real-time.