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Elon Musk

Four stiff challenges Elon Musk will have to overcome to turn his Mars dream into reality

Four stiff challenges Elon Musk will have to overcome to turn his Mars dream into reality

SpaceX Chief Executive Elon Musk has finally laid out his plans to eventually transport up to a million people to colonize Mars. But there are more than a few hurdles he’ll have to clear first.

In a speech Tuesday at the International Astronautical Congress in Guadalajara, Mexico, Musk presented a grand vision — massive rockets launching a fleet of 1,000 spaceships that would each carry about 100 people to Mars.

The huge rocket boosters would be reusable, barreling back to Earth after hoisting the spaceships into a “parking orbit,” and then returning three or four times with propellant tankers to refuel the ships for...

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