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NASA's Mars Exploration Rover (MER) mission was a robotic space mission involving two Mars rovers, Spirit and Opportunity, exploring the planet Mars. It began in 2003 with the launch of the two rovers to explore the Martian surface and geology ; both landed on Mars at separate locations in January 2004.
In the rock are many deeply carved bedrock mortar holes, used for food preparation. [6] Between 700 BC and AD 300, these caves and the nearby area was an Ohlone village called Chitactac. [citation needed]