Fathers. Husbands. Astronauts. Get to know astro.behnken and astro.doug, the nasa astronauts traveling to the iss on the spacex Dragon Capsule. Follow live coverage of the historic launch today at 2p ET/11a PT on #SpaceLaunchLIVE. . . . . . . #spacex #nasa #astronaut #sciencechannel #discovery #discoverychannel #spacelaunch #demo2