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In this artist's concept of the future, an astronaut gathers samples on the surface of Mars, while a robotic explorer stands by to help. | NASA
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Journeying to Mars -- on a One-Way Ticket

Journeying to Mars could be cheaper on a one-way ticket. Find out why journeying to Mars or other destinations could be cheaper on a one-way ticket.

November 1, 2010
3:00 AM EDT