"NASA has executed a flawed acquisition for the Human Landing System programme and moved the goalposts at the last minute," Blue Origin said in a statement on Monday.
Calling NASA's decision "high risk," the company said that the decision "eliminates opportunities for competition, significantly narrows the supply base, and not only delays, but also endangers America's return to the Moon. Because of that, we've filed a protest with the GAO".
NASA was yet to comment on the Blue Origin's protest.
Musk responded to Blue Origin's protest with a tweet: "Can't get it up (to orbit) lol".
The contract is part of NASA's Artemis programme, which aims to return astronauts to the moon by 2024 as a stepping stone to the first human mission to Mars.
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