Start your #technologytuesday off right with an amazing view of an RS-25 engine, formerly a main engine of NASA's space shuttle, firing up on the A-1 test stand at Stennis Space Center (nasastennis) in Bay St. Louis, Mississippi. This series of testing provides NASA engineers critical data on the engine controller unit and inlet pressure conditions. Four RS-25 engines will power NASA's Space Launch System (SLS) rocket on upcoming missions into deep space . Credit: NASA #nasa #nasasls #engines #stennis #techtuesday #journeytomars #slsfiredup