NASA prepares a new set of twin satellites to track ice melt
NASA is preparing another mission of twin satellites to track Earth's water cycle, ice sheet and crust. The satellites will be able to map such changes by tracking changes in their 220-km separation with a hair-width accuracy. Called GRACE-FO (Gravity Recovery and Climate Experiment Follow-On), the US-German project would continue research of the 15-year GRACE mission that ended in 2017.