The biggest challenge in building a civilization on Mars is getting a large number of people there who may choose to stay permanently.

The future may see humanity colonizing other planets, driven by advancements in technology and a desire to explore beyond Earth.

Space exploration is becoming increasingly important as we look to the future, and I hope we will make significant advancements in that area.

To be a multi-planetary species, we must ensure that we can return to Mars regularly, not just leave flags and footprints like we did on the Moon.

To become a space-faring civilization, we must solve the problem of rocket reusability, as all other modes of transport are reusable.

To support a large civilization in space, we will need giant space stations, as planetary surfaces are too small for such a population.

As a species, we must continue to improve and reach higher ground; it would be tragic if the Apollo missions were the peak of human achievement in space.

A Mars city must be able to survive independently if spaceships from Earth stop coming, which means it needs all critical resources.

The goal of SpaceX is to advance rocket technology, particularly by developing a rapidly and fully reusable rocket, which is essential for humanity to become a space-faring civilization.