Nisar launch: Why Nasa-Isro joint satellite is a big deal

Nasa-Isro Synthetic Aperture Radar, or Nisar, will liftoff onboard the Indian space agency’s GSLV Mk-II rocket from Sriharikota on Wednesday (July 30). Jointly developed by Isro and Nasa, it is the first major earth-observing satellite with two frequencies — L-band and S-band. Here’s what makes it special

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