SLS: Nasa’s ‘megarocket’ set to fire up engines in crucial test

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The four main engines of Nasa’s new “megarocket” are to be fired in unison for the first time, demonstrating the launcher’s raw, explosive power. The Space Launch System (SLS) is part of the US space agency’s Artemis programme, which aims to put Americans back on the lunar surface by 2024. The engine “hotfire” is the last in a series of tests known as the Green Run. It will help Nasa certify the rocket for its maiden flight, scheduled to take place later this year. When it completes that flight, the SLS will become the most powerful rocket ever to have flown to space. This uncrewed mission, called Artemis-1, will launch Nasa’s next generation spacecraft, Orion, on a loop around the Moon.