NASA heavy rocket may not get off the ground in time for Lunar mission
The $12 billion Space Launch System (SLS) super heavy rocket program, under development by Boeing since 2011, was intended to be inaugurated a year ago, with the timetable slipping to 2019 and recently, to 2020. NASA Administrator Jim Bridenstine has told US lawmakers that with its SLS rocket behind schedule, the agency is considering the use of commercial rockets for its upcoming Moon mis