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Subject :NASA's Boeing moon rocket cuts short 'once-in-a-generation' ground test
NASA's Boeing moon rocket cuts short 'once-in-a-generation' ground test
NASA's deep space exploration rocket built by Boeing briefly ignited all four engines of its behemoth core stage for the first time on Saturday, cutting short a crucial test to advance a years-delayed US government programme to return humans to the moon in the next few years.
Mounted in a test facility at NASA’s Stennis Space Center in Mississippi, the Space Launch System’s (SLS) 212-ft tall core stage roared to life at 4.27pm local time (2227 GMT) for just over a minute — well short of the roughly four minutes engineers needed to stay on track for the rocket's first launch in November this year.
"Today was a good day," NASA administrator Jim Bridenstine said at a press conference after the test, adding "we got lots of data that we're going to be able to sort through" to determine if a do-over is needed and whether a November 2021 debut launch date is still possible.
The engine test, the last leg of NASA’s nearly year-long “Green Run” test campaign, was a vital step for the space agency and its top SLS contractor Boeing before a debut unmanned launch later this year under NASA’s Artemis program, the Trump administration’s push to return U.S. astronauts to the moon by 2024.
It was unclear whether Boeing and NASA would have to repeat the test, a prospect that could push the debut launch into 2022. NASA's SLS program manager John Honeycutt, cautioning the data review from the test is ongoing, told reporters the turnaround time for another hot fire test could be roughly one month.
To simulate internal conditions of a real liftoff, the rocket’s four Aerojet Rocketdyne RS-25 engines ignited for roughly one minute and 15 seconds, generating 1.6 million pounds of thrust and consuming 700,000 gallons of propellants on NASA’s largest test stand, a massive facility towering 35 storeys tall.
The expendable super heavy-lift SLS is three years behind schedule and nearly US$3 billion over budget. Critics have long argued for NASA to retire the rocket’s shuttle-era core technologies, which have launch costs of US$1 billion or more per mission, in favour of newer commercial alternatives that promise lower costs.
By comparison, it costs as little as US$90 million to fly the massive but less powerful Falcon Heavy rocket designed and manufactured by Elon Musk's SpaceX, and about US$350 million per launch for United Launch Alliance's legacy Delta IV Heavy.
While newer, more reusable rockets from both companies - SpaceX's Starship and United Launch Alliance's Vulcan - promise heavier lift capacity than the Falcon Heavy or Delta IV Heavy potentially at lower cost, SLS backers argue it would take two or more launches on those rockets to launch what the SLS could carry in a single mission.
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