New Shepard is on track to be the first commercial space flight to take a civilian beyond the Kármán line, the internationally recognised edge of space, more than 60 miles above earth.

The high-risk endeavour will come just two weeks after Bezos officially stepped down as chief executive of, the $1.6tn ecommerce group he founded, on July 5.

Blue Origin has previously declined to discuss whether Bezos planned to join its first commercial flight himself.

Almost 6,000 people have bid the price of a seat on New Shepard up to $2.8m, Blue Origin said on Monday.

“To see the earth from space changes you — it changes your relationship with this planet, with humanity. It’s one Earth,” Bezos said in Monday’s Instagram video, adding that it would be “meaningful” to take along his younger brother.

Mark Bezos said he was “awestruck” by the “unexpected” invitation, calling it a “remarkable opportunity”.

Mark Bezos is the founder of HighPost Capital, a New York-based private equity firm that is partially owned by the Bezos family. He also works with Robin Hood, a New York anti-poverty charity, and as a volunteer firefighter in Scarsdale, an affluent suburb in Westchester County.

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