A team led by Jeff Bezos's rocket company has won a coveted $US3.4 billion ($5.1 billion) NASA contract to build a spacecraft to fly astronauts to the Moon's surface, the US space agency says.
It was a breakthrough for Blue Origin two years after it lost out to Elon Musk's SpaceX in another competition.
NASA will get astronauts to lunar orbit using its own rockets and capsules, but wants private companies to take over from there.
It is more than a half-century since the end of the Apollo lunar missions.
Blue Origin plans to build its 16-metre tall Blue Moon lander in partnership with Lockheed Martin, Boeing, software firm Draper and robotics firm Astrobotic.
NASA picked Blue Origin over a rival bid led by Leidos-owned defence contractor Dynetics that also included Northrop Grumman.
NASA's decision to go with Mr Bezos and Blue Origin will give it a second option for sending astronauts to the Moon under its Artemis program.
NASA awarded fellow billionaire Mr Musk's SpaceX $US3 billion ($4.5 billion) in 2021 to build its Starship spacecraft to land astronauts on the lunar surface for the first time since the final Apollo mission in 1972. The first two Starship missions are slated for later this decade.
"I've said it before: we want more competition, we want two landers," NASA administrator Bill Nelson said at an event announcing the contract at NASA's headquarters.
"It means that you have reliability, you have backups."
The contract follows NASA's trend in recent years in which it helps fund development of private astronaut spacecraft, then pays to use the craft in missions rather than spending more to own the vehicle entirely.
Blue Origin, founded in 2000, is investing "well north" of the $US3.4 billion figure to develop the spacecraft, the company's lunar lander chief John Couluris told reporters at the event.
Mr Couluris said that Blue Origin, not NASA, would pay for any cost overruns.
"Honoured to be on this journey with @NASA to land astronauts on the Moon — this time to stay," Amazon.com billionaire founder Mr Bezos — the owner of Amazon — said on Twitter after the announcement.
NASA said in a contract document that it picked Blue Origin's proposal for its lower price, extra lander capabilities and a plan to execute two test landing missions on the Moon in 2024 and 2025 at the company's expense.
But NASA expressed concern about "numerous conflicts and omissions" in Blue Origin's proposed schedule and development deadlines.
The Dynetics-led bid raised NASA concerns over whether it met technical requirements, and the price was "substantially higher", the contract document said.
A long-term presence
The Artemis program envisions building a long-term presence on the Moon.
SpaceX's Starship lander is poised to conduct the first two astronaut Moon landings, followed by a similar mission in 2029 with Blue Origin's lander.
Each is expected to put two astronauts on the Moon's surface.
Friday's announcement was a long-awaited outcome for Mr Bezos, who has invested billions of dollars for Blue Origin to vie for high-profile space awards with SpaceX, a dominant force in satellite launches and human spaceflight.
Blue Origin and Dynetics lost to SpaceX in 2021, with NASA primarily blaming budget constraints for going with only one company.
After losing that competition, Blue Origin unsuccessfully sought to overturn NASA's decision, first with a watchdog agency and then in court. Blue Origin and US politicians had pressed NASA to procure a second lander.
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