On Sept. 27, during a session at the International Astronautical Congress, Elon Musk will provide details about his Mars mission and colonization plans for the first time in a public forum.

However, he tweeted the name of his new megaspaceship will not be the Mars Colonial Transport it will be the interplanetary transport system. Elon plans to go beyond Mars to the entire solar system.

Mars isn’t the solar system’s only marginally habitable world for would-be new world colonists. The Moon, Venus, the asteroid Ceres, Titan and Callisto all have some advantages that could allow for colonies to subsist. Musk now seems to be suggesting that some of these more distant destinations, especially moons around Jupiter and Saturn, might be reachable with the Interplanetary Transport System.

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