WASHINGTON – In less than five years, a married couple could be on their way toward Mars in an audacious but bare-bones private mission that would slingshot them around the red planet, under a plan announced Wednesday by a financial tycoon and his team.

The voyage to Mars and back would be a cosmic no-frills flight that would take the husband-and-wife astronauts as close as 100 miles to the planet, but it would also mean being cooped up for 16 months in a cramped space capsule half the size of an RV.

The private, nonprofit project, called Inspiration Mars, will get initial money from multimillionaire investment consultant Dennis Tito, the first space tourist.