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Allen left Microsoft Corp. in 1983, and has pursued many varied interests since then. He’s the owner of the Seattle Seahawks football team as well as the NBA’s Portland Trailblazers. He also founded a Seattle museum that emphasizes science fiction.

Allen said this venture fits with his technology bent.

“I’m a huge fan of anything to push the boundaries of science,” Allen said.

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Borenstein contributed to this report from Washington.

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Online:

Stratolaunch Systems: http://www.stratolaunch.com