Man and woman, preferably married, wanted for expedition to Mars

A nonprofit foundation wants to recruit a man and a woman - possibly a married couple - for a bare-bones, 501-day journey to Mars and back that would start in less than five years, project organizers said on Wednesday.

The mission, expected to cost upwards of $1 billion, would be privately financed by donations and sponsorships.

Project founder Dennis Tito, a multimillionaire who in 2001 paid $20 million for a trip to the International Space Station, said he will pay start-up costs for two years to begin development of life-support systems and other critical technologies.

Currently, there are no U.S. human spaceships in operation, but several are under development and expected to be flying by 2017.

That leaves little time to take advantage of a rare planetary alignment that would allow a craft to loop around Mars, coming as close as about 150 miles (241 kilometers) to the planet's surface, before returning to Earth.

The launch window for the mission opens on January 5, 2018. The next opportunity is not until 2031.

"If we don't make 2018, we're going to have some competition in 2031," Tito told Reuters.

"By that time, there will be many others that will be reaching for this low-hanging fruit, and it really is low-hanging fruit," said Tito, who set up the nonprofit Inspiration Mars Foundation to organize the mission.

The spacecraft will be bare-bones, with about 600 cubic feet (17 cubic meters) of living space available for a two-person crew. Mission planners would like to fly a man and a woman, preferably a married couple who would be compatible during a long period of isolation.

The capsule would be outfitted with a life-support system similar to the one NASA uses on the space station, which recycles air, water, urine and perspiration.

If launch occurs on January 5, 2018, the capsule would reach Mars 228 days later, loop around its far side and slingshot back toward Earth.

The return trip takes 273 days and ends with an unprecedented 31,764-mph (51,119-kph) slam into Earth's atmosphere.

The crew would spend much of their time maintaining their habitat, conducting science experiments and keeping in touch with people on Earth.