NASA says core stage of next Moon rocket now ready

NASA has completed the giant rocket that will take US astronauts back to the Moon, the space agency's head announced Monday, pledging the mission would take place in 2024 despite being beset by delays. The Space Launch System (SLS) is the tallest rocket ever built at a towering 212 feet (65 meters), the equivalent of a 20-story building. It is also the most powerful, designed to reach a record-breaking speed of Mach 23 before separating from its upper stage, the Orion crew capsule.

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