There is no greater hero in our search for life on mars than a little robot named Opportunity.
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Otherwise landed in 2004 with its twin - MER-A, better known as Spirit. These six-wheeled golf-cart-sized robots were Swiss army knives of geological lab instruments. Opportunities most spectacular discovery where these cute little so-called berries. They turned out to be concretions of hematite - which means they were grown in wet environments with dissolved iron. Wet means water FYI. Both rovers found a variety of other geological signs of past water activity, really solidifying the picture of Mars' much more liquid past. Both rovers were supposed to shut down after around 90 days as Martian dust accumulated on their solar panels, cutting of their power supply.
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