In 1519 Ferdinand Magellan began the first voyage around the world. He sailed from Spain with 270 men and five of the best ships ever built. Just under three years later, 18 sailors and one ship returned. Mutiny, scurvy, and poor navigation killed the rest. Fast forward to the year 2015, nearly 500 years after Magellan set sail. A group of six space explorers sets off toward Mars in the best rocket ship ever built. Many scientists in the space community believe this scenario will come true.