SpaceX successfully launches Nasa astronauts into orbit

* Donald Trump and Mike Pence witness launch in Florida* First attempt was cancelled minutes from blast-offA rocketship named Dragon breathed new fire into America’s human spaceflight programme on Saturday, carrying two astronauts on a much-anticipated adventure.The launch of the SpaceX Falcon 9 rocket and Dragon crew capsule from Florida’s Kennedy Space Center to the International Space Station (ISS) marked the first time since 2011 that humans had blasted off into orbit from US soi