In the early years of manned space flight, having the right stuff meant being brave enough to fly the first rocket-propelled planes. Today, it means spending perhaps the rest of your life on the planet Mars.
Dutch-based Mars One, which plans to set up the first human colony on Mars in 2023, has announced a global search for pioneers willing to settle there.
Mars One says candidates do not need a science degree, flying experience, or military training. They just need to be at least 18 years old, in good mental and physical health, and willing to undergo eight years of training.
Mars One says it will choose four candidates through what it says will be an international television reality series simulating the entire mission from launch to landing and living on Mars.