SpaceX reveals plan for manned journey to Mars by 2024

Elon Musk, Chief Executive Officer (CEO) of Space Exploration Technologies Corporation (SpaceX), speaks on the final day of the 68th International Astronautical Congress (IAC) in Adelaide, Australia, on Sept. 29, 2017. SpaceX unveiled its plans to put humans on Mars as early as 2024 in Australia on Friday. (Xinhua/Xu Haijing)