The huge, reusable rocket-spaceship combo called the Interplanetary Transport System (ITS), will establish a million-person city on Mars within the next 50 to 100 years. The 30-foot-wide (now called BFR) booster would feature 31 Raptor engines. The BFR booster will be capable of lofting 150 tons to low Earth orbit (LEO), making it more powerful than NASA’s Saturn V moon rocket. After it would launch the spaceship to Earth orbit it will come back down to its pad for a pinpoint landing.
SpaceX new vision about Mars colonization
The spaceship would be fueled in orbit by a tanker (which would also be launched by an ITS booster). The ITS spaceships would linger in orbit until the time was right to depart for Mars. Than it will be a mass launch. Such windows come along once every 26 months. With 100 people on each ship, the Mars mission from the Earth will be the biggest provocation of the time. It’s supposed that the ships will use later locally produced propellant (methane and oxygen) and then launch back to Earth. SpaceX wants all the resources that are used for Falcon 9, Heavy and Dragon can be applied to this system. If all goes according to plan, two cargo ships and two crew ships will depart for the Red Planet in 2024 to set up the propellant-production plant and begin building a base in earnest.