NASA rules out crew on first flight of super rocket

NASA managers have ruled out putting a crew on board an Orion capsule atop the agency's huge Space Launch System rocket for the gargantuan booster's maiden flight in 2019, citing technical risks and higher costs, up to as much as $900 million, agency officials said Friday.Earlier this year, the Trump administration asked NASA to look into the possibility of either adding a crew to Exploration Mission 1, EM-1 for short, or moving up the launch of EM-2, the flight NASA already earmarked for the SL