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Exploration Ground Systems is set to build a storage tank at NASA 's Kennedy Space Center that will hold up to 1.25 million gallons of liquid hydrogen ( H2 ) , which will be used in the agency ’s Space Launch ##er rocket that will launch NASA 's Discovery spacecraft . A new integrated refrigeration and storage system will remove heat energy from the tank to better cool the tank and to reduce loss of H2 through boil off by around 46 % .