An auction for a ride into space next month alongside Jeff Bezos and his brother has ended with a winning bid of $US28 million ($A36 million).
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The Amazon founder's rocket company, Blue Origin, did not disclose the winner's name following the live online auction.
The identity will be revealed in a couple weeks - closer to the brief up-and-down flight from West Texas on July 20, the 52nd anniversary of Neil Armstrong and Buzz Aldrin's moon landing.
It will be the first launch of Blue Origin's New Shepard rocket with people on board, kicking off the company's space tourism business.
Fifteen previous test flights of the reusable rocket and capsule since 2015 - short hops lasting about 10 minutes - were all successful.
Saturday's auction followed more than a month of online bidding that reached $4.8 million by Friday.
More than 7,500 people from 159 countries registered to bid, according to Blue Origin. More than 20 bidders - the high rollers - took part in Saturday's auction.
Bezos announced Monday that he and his younger brother, Mark, would be on board New Shepard's first crew flight; the news quickly boosted bidding.
The winning amount is being donated to Blue Origin's Club for the Future, an educational effort to promote science and tech among young people.
The completely automated capsule can carry up to six passengers, each with their own big window.
Blue Origin's top sales director, Ariane Cornell, said following the auction that the fourth and final seat on the debut crew flight will be announced soon.
Blue Origin has yet to open ticket sales to the public or divulge prices.
Australian Associated Press
