Mark Kelly (Nicholas Kamm/AFP)

Mark Kelly is retiring from NASA and the Navy to help wife Gabrielle Giffords in her recovery — and to collaborate with her on a memoir. Scribner announced Tuesday that the congresswoman and the astronaut will tell the story of their life before and since her January wounding in a Tucson shooting rampage. Author Jeffrey Zaslow will assist; the contract was negotiated by D.C. superlawyer Bob Barnett. (The AP notes that as a member of Congress, Giffords can receive no advance.) Kelly, who returned to Earth June 1 after captaining the final Endeavour flight, also announced his retirement Tuesday, adding he’s “hopeful that one day I will again serve our country.”

Tracy Morgan in Nashville Tuesday. (Mark Humphrey/AP)

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