NASA: Shielding, New Propulsion Technologies Needed for Manned Mission to Mars

The U.S. space agency is relying on findings from an ongoing, unmanned mission to Mars as it shapes plans for a human mission to that planet in the mid-2030s.

As NASA’s Mars Science Laboratory sped toward the Red Planet in 2011 and 2012, an instrument called the Radiation Assessment Detector measured radiation levels that a space crew could experience during the long journey.  

New findings published in the journal Science indicate a trip to Mars could subject space travelers …

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