Strap yourselves into the spacex Dragon capsule that will take nasa astronauts to the iss Wednesday. You can watch #NASA & #SpaceX: Countdown to Launch Tuesday at 10pm ET, then tune into Discovery Wednesday beginning at 2pm ET/11am PT for live coverage of the Demo-2 launch on #SpaceLaunchLIVE! . . . . . . #space #astronaut #discovery #sciencechannel #spacelaunch