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CAPE CANAVERAL, Fla. — A billionaire’s private SpaceX flight has filled its two remaining seats with two longtime space fans.

The newest passengers are Sian Proctor, scientist-educator from Arizona, and Seattle-area data engineer Chris Sembroski, whose college buddy actually won the seat in a lottery but gave him the prize.

The two were introduced Tuesday as the newest crew members. They will join tech businessman Jared Isaacman, who’s paying for the three-day ride around the globe this fall while also raising money for St. Jude Children’s Research Hospital in Memphis, Tennessee.  

Hayley Arceneaux, an employee of St. Jude’s, was previously selected as a passenger.