Musk Needs More Than an Enormous Rocket to Build His ‘City on Mars’

The SpaceX founder’s lifelong dream of Mars exploration has obstacles to overcome. Lots of them.

Elon Musk reveals plan for a city on Mars.

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SpaceX founder Elon Musk on Tuesday unveiled his vision for “making humans a multiplanetary species.” It may be the most ambitious and fraught endeavor ever proposed by man.

Humans have placed robots on the surface of the red planet and flown satellites around it, providing high-resolution analysis of its surface and a sense of its geology. But it’ll take more than a decent map to find our way. Despite the phenomenal resources and record Musk brings to the enterprise, there remain a few planet-size holes in his plan.