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A beefed-up rocket passes a key milestone toward its debut flight in 2018.
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The SLS five-segment Solid Rocket Motor undergoes a static test fire at the Orbital ATK facility in Promontory, Utah, March 11, 2015. The beefed-up space shuttle solid rocket motor passed a two-minute test firing on Wednesday, a key milestone toward the debut flight of NASA's deep-space launcher in 2018. REUTERS/Jim Urquhart
The SLS five-segment Solid Rocket Motor undergoes a static test fire at the Orbital ATK facility in Promontory, Utah, March 11, 2015. REUTERS/Orbital ATK/NASA
Members of the media gather around the SLS five-segment Solid Rocket Motor before it undergoes a static test fire at the Orbital ATK facility in Promontory, Utah, March 11, 2015. REUTERS/Jim Urquhart
The SLS five-segment Solid Rocket Motor undergoes a static test fire at the Orbital ATK facility in Promontory, Utah, March 11, 2015. REUTERS/Jim Urquhart
People take pictures as the SLS five-segment Solid Rocket Motor undergoes a static test fire at the Orbital ATK facility in Promontory, Utah, March 11, 2015. REUTERS/Jim Urquhart
Engineers ready the SLS five-segment Solid Rocket Motor for a static test fire at the Orbital ATK facility in Promontory, Utah, March 11, 2015. REUTERS/Jim Urquhart
People take pictures as the SLS five-segment Solid Rocket Motor undergoes a static test fire at the Orbital ATK facility in Promontory, Utah March 11, 2015. REUTERS/Jim Urquhart
Members of the media gather around the SLS five-segment Solid Rocket Motor before it undergoes a static test fire at the Orbital ATK facility in Promontory, Utah, March 11, 2015. REUTERS/Jim Urquhart
People take pictures as the SLS five-segment Solid Rocket Motor undergoes a static test fire at the Orbital ATK facility in Promontory, Utah, March 11, 2015. REUTERS/Jim Urquhart