Images: This pair of drawings depicts the same location on Mars at two points in time: now and billions of years ago. The location is in Gale Crater, near the Red Planet’s equator. 1 shows a present-day snapshot of the northern half of Gale Crater. North is to the left. The underlying basement is the crust of Mars that forms the crater’s rim (left) and central peak (right). About 3.5 billion years ago, rivers brought sediment into the crater, depositing pebbles where the river was flowing more quickly, sand where the river entered a standing body of water in the center of the basin, and silt within this lake. Lake level rose over time as the sediments built up. Eventually they were buried by dry dust...
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