Space Launch System Booster Test Fire Shakes the Ground in Utah

The Space Launch System (SLS) is how NASA calls the rocket that will carry humans back to the Moon by the middle of the decade, and possibly even on to Mars in the more distant future. And at the core of the SLS are the “largest, most powerful boosters ever made.” Two of them, accompanied by four RS-25 engines and the core stage, provide about 75 percent of the combined output of 8.8 million pounds of thrust during lau...