SpaceX astronaut mission looking 'increasingly difficult' in 2019: executive

One of the space company's Crew Dragon capsules exploded on a test stand at a Florida Air Force station moments before firing eight emergency abort thrusters designed to propel an on-board crew to safety in the event of a failure.Crew Dragon was slated earlier this year to carry U.S. astronauts to the International Space Station in a first manned test mission in July, although that date slipped until November following the explosion and some other hitches in the vehicle's design."I'm pretty opti