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For the long haul to Mars, keep your diet close to the Earth

On the Apollo missions, astronauts ventured about 400,000km (249,000 miles) from Earth and spent 8-12 days away from home. A trip to Mars would involve 56 million km travelling over eight or nine months – and a stay of about two years, to wait for the two planets to be close enough again to make the return journey over that shortest distance.

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