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Date: 2015-04-18 10:50:14Space technology Mars exploration Margaritifer Sinus quadrangle Opportunity rover Steve Squyres Mars rover Spirit rover Spaceflight Spacecraft Mars Exploration Rover | Rock appears mysteriously in front of Mars Opportunity roverAdd to Reading ListSource URL: phys.orgDownload Document from Source WebsiteFile Size: 67,63 KBShare Document on Facebook |