Explanation:

NISAR:

• NASA-ISRO Synthetic Aperture Radar (NISAR) is an SUV-sized satellite that is being jointly developed by the space agencies of the US and India.
• The partnership agreement was signed between NASA and ISRO in September 2014, according to which NASA will provide one of the radars (L-band radar) for the satellite, a high-rate communication subsystem for science data, GPS receivers and a payload data subsystem. ISRO, on the other hand, will provide the spacecraft bus, the second type of radar (called the S-band radar), launch vehicle and associated launch services.
• NISAR will be equipped with the largest reflector antenna ever launched by NASA and its primary goals include tracking subtle changes in the Earth’s surface, spotting warning signs of imminent volcanic eruptions, helping to monitor groundwater supplies and tracking the rate at which ice sheets are melting.
• Essentially, SAR refers to a technique for producing high-resolution images. Because of the precision, the radar can penetrate clouds and darkness, which means that it can collect data day and night in any weather.
• NISAR is an all-weather satellite that’s going to give us an unprecedented ability to look at how Earth’s surface is changing.