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Manned Mars mission: Rx for problems?

(CNN) -- Scientists have been sending spacecraft to Mars for a quarter of a century, but a manned mission so far remains the stuff of Hollywood movies.

CNN's Miles O'Brien has more on possible medical problems on a mission to Mars (July 18)

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Sending astronauts to the red planet would pose numerous risks. Mechanical problems could handicap the vessel, or natural phenomena could have an unexpected effect on the mission. Another concern: medical problems among the crew during the lengthy flight.

How could NASA or another space agency adequately prepare for a medical emergency on such a long mission? CNN's Miles O'Brien examines the issue.

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