The liquid oxygen tank and the liquid hydrogen tank are the parts of the #NASASLS core stage that hold more than 700,000 gallons of propellant to power four RS-25 engines and send SLS and @NASA_Orion into deep space. >> https://t.co/D2X5HoeDJi pic.twitter.com/aHsdnTZRpl

— NASA_SLS (@NASA_SLS) November 18, 2017