NASA is racing to come up with a new, cheaper road map to Mars.
The space agency said Friday that it's seeking ideas from scientists and engineers around the globe for robotic missions it can do in 2018 and beyond.
Earlier this year, NASA pulled out of a partnership with the Europeans due to budget cuts. NASA and the European Space Agency had been working on missions targeted for 2016 and 2018 that woud have marked the first steps toward bringing Martian soil and rocks back to Earth.
The Europeans say they will continue moving ahead with the multibillion-dollar ExoMars program, thanks to a newly forged arrangement with Russia.
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