- SpaceX Engineer Details Ambitious Plan to Build ‘Multiple Cities on Mars’ - SpaceX will launch two rockets and their corresponding spaceships to Mars in 2022 filled with supplies, and send four more in 2024, two of which will ferry the first humans to the planet to set up an outpost. https://www.inverse.com/article/48612-spacex-engineer-details-ambitious-plan-to-build-multiple-cities-on-mars 4 comments space