WATCH NOW!🔴 See what it's like to work on a space mission that's about to launch. Go behind the scenes with @NASA project scientist Josh Willis & system safety engineer Jennifer Hasenoehrl before Sentinel-6 Michael Freilich lifts off. (2/3)#SeeingTheSeas#Sentinel6#Sentinerdspic.twitter.com/kl5cCEnN5I
