Nasa explored putting astronauts into a hibernation-like state for Mars missions, but scientists are still trying to make the science-fiction idea safe for humans

Sending humans to Mars is one of Nasa's greatest ambitions, but the journey presents enormous challenges. A round trip could take well over a year, exposing astronauts to dangerous cosmic radiation, muscle and bone loss caused by microgravity, psychological stress and the need to carry vast amounts of food, water and supplies.

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