It takes three days to travel to the moon and six months to get to Mars. But the real challenge is not getting there, it’s what to eat.

“Space agriculture is what’s required for long-term space exploration,” Mike Dixon, director of the controlled environment systems research facility at the University of Guelph, said Tuesday during a space conference in Montreal. “We can’t afford to keep shipping water, oxygen and Kraft dinner to the moon indefinitely.”

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