Expedition 51 NASA Flight Engineer Jack Fischer's family is seen at a pre-launch press conference on Wednesday, April 19, 2017 at the Cosmonaut Hotel in Baikonur, Kazakhstan. From left to right are Fischer's daughter, Sariah, his wife, Elizabeth, and daughter Bethany. Launch of the Expedition 51 crew is scheduled for April 20 and will carry Fischer and Soyuz Commander Fyodor Yurchikhin of Roscosmos into orbit to begin their four and a half month mission on the International Space Station. Photo Credit: (NASA/Aubrey Gemignani).

Expedition 51 Flight Engineer Jack Fischer's wife, Elizabeth Fischer, left, and daughters Sariah (not pictured) and Bethany, right, reach up to the bus window to bid farewell to Fischer as he departs the Cosmonaut Hotel to suit-up for his Soyuz launch to the International Space Station on Thursday, April 20, 2017 in Baikonur, Kazakhstan. Launch of the Soyuz rocket is scheduled for 1:13PM April 20 Baikonur time and will send Fischer and Soyuz Commander Fyodor Yurchikhin of Roscosmos on a four and a half month mission aboard the International Space Station. Photo Credit: (NASA/Aubrey Gemignani)

Expedition 51 Flight Engineer Jack Fischer of NASA speaks with his family after having his Russian Sokol suit pressure checked in preparation for launch onboard the Soyuz MS-04 spacecraft on Thursday, April 20, 2017 at the Baikonur Cosmodrome in Kazakhstan. The Soyuz spacecraft with Fischer and Soyuz Commander Fyodor Yurchikhin of Roscosmos is scheduled to launch at 1:13 p.m. Baikonur time on April 20. Photo Credit: (GCTC/Andrey Shelepin)