SpaceX's first rocket launch of 2018 carries one of the most secretive payloads – the mysterious Zuma satellite that reportedly belongs to an unknown branch of the US government. SpaceX's Falcon 9 rocket will lift off from Cape Canaveral on 5 January, buy mystery surrounds the Zuma mission as no one appears to know what the satellite has been designed to do and how long it is expected to take to complete its secretive mission. All that appears to be known at the moment is that the satellite will be in a low-Earth orbit and was manufactured for the US government by Northrop Grumman.