A second launch attempt for the SpaceX Dragon spacecraft is scheduled for 3:44am EDT, Tuesday May 22. Weather is currently 80% go. Watch it live here. For background, watch Miles O'Brien's PBS NewsHour feature, and SpaceFlightNow's QA with SpaceX CEO Elon Musk. SpaceFlightNow will also have live coverage from Mission Control, with streaming video. (Image: SpaceFlightNow)