By K.S. McNutt Staff Writer kmcnutt@oklahoman.comThirteen female pilots aced the same tests as the men who became NASA's first astronauts, but were deemed unfit for space flight because they were women. "Mercury 13," a new Netflix documentary directed by David Sington and Heather Walsh, tells the story of the women who dreamed of becoming astronauts two decades before Sally Ride took that step. The oldest candidate, Jane Hart, was a 41-year-old mother of eight and the wife of U.S.