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Blueberry bonanza
Almost immediately after it landed in 2004 in a region of Mars called Meridiani Planum, Opportunity made a discovery watershed: the rocks at its landing site was formed in ancient lakes.
The test came in part from small "blueberries" made of hematite, which almost always forms in water.
The curved lines of sediment said sweeping motion of a stream, while the sulfate salts and the mineral jarosite, which forms in dilute sulfuric acid on Earth, suggests that the water was salty and acidic.
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