nasa astronaut peggy whitson, a cosmonaut, and frenchman thomas pesquet from the european space agency gave their last press conference from behind a glass window before they embark on the proxima mission named for the closest star to the sun. two of the members have already undertaken missions on the iss, but for 38-year-old thomas pesquet, it will be his first time there. >> i still can't believe it. i really need to be sitting in the spacecraft and feel the vibrations of takeoff, and see the earth getting smaller and smaller. and then it will hit me. reporter: pesquet's journey has been seven years in the making, as he told "france 24" earlier this year. >> we did some survival trainings, to survive by ourselves in case we have to wait for the rescue party for a couple days. reporter: this will also be a particularly special mission for peggy whitson. she will become the first woman to command the space station twice. the trio will orbit earth for 2 days inside the spacecraft before finally stopping on the iss on saturday. there they will join three other astronauts. the group will