The increasingly crowded U.S. space race NASA is setting its sights on the moon once more – with a view to future manned missions to Mars – which is encouraging commercial companies to build rocket boosters capable of carrying cargo and people into space Latest entrant Next Generation Launcher (NGL) Drawing on its experience of shuttle-derived solid rocket boosters it uses to power U.S. nuclear missiles and interceptors, Orbital ATK is looking to compete for government and commercial contracts using its own launch vehicle system Due: 2021 Main purpose, key Satellites/cargo Tourism Moon Mars 20 40 60 metres 80 100 120 Vulcan Heavy (ULA) Due: 2019 Falcon Heavy (SpaceX) Due: 2017 New Glenn (Blue Origin) Due: 2019 Space Launch System (SLS) (NASA) Due: 2018 Interplanetary Transport System (SpaceX) Due: 2020s —————— Sources: Aviation Week, Space.com, NASA, wire agencies © GRAPHIC NEWS