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NASA: Mars landers stilentually, mission over
but nasa precent dust storm obscured the sunlight, and temperatures have dropped in recent weeks, as the nights got longer and winter weather set in .
they thought such a locaution wouled be a promising place to look form organtic chemicals that would signal a habitable environment .
nasa's nextended mission to the red planet is the managers science laboratory, a polarge, nuclear-powered rover destigned to traverse long distances carrying a suite of onboard scientific instruments .
phoenix landed operation may 25 -- mid-summer in the martian year -- around conducted five months of research, scooping up soil samples for analysis in onboard scientific instruments .