#Sentinel3 B launch will be a special one: for the first months the twin satellites will fly only 30 seconds & 223 kms apart! The tandem configuration is designed to understand any subtle differences between the instruments: https://t.co/aoysmpZHcQ pic.twitter.com/tXN9rMx3Eo

— ESA EarthObservation (@ESA_EO) February 8, 2018