The mobile service tower retracts from the Atlas 5 rocket, revealing the 191-foot-tall vehicle for liftoff from Vandenberg Air Force Base, California, carrying the classified NROL-79 national security payload for the U.S. government.
Credit: United Launch Alliance
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The United Launch Alliance Delta 4 rocket, standing 217 feet tall and weighing 900,000 pounds, unleashes 1.8 million pounds of thrust from its main engine and four side-mounted boosters at 6:53 p.m. EST (2353 GMT) Wednesday to launch the eighth Wideband Global SATCOM satellite for U.S. military communications.
A balky interplanetary seismic instrument that ran into technical problems in 2015, forcing a two-year delay in the launch of NASA’s InSight lander to Mars, cleared a major test last week after engineers redesigned part of the sensor package, boosting confidence that the mission will be ready to blast off in May 2018.
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