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Is "When NASA sent the robotic explorers Spirit and Opportunity to Mars in 2003, they were expected to survive ninety days." an anecdote when used in the below passage?

On the other hand, machines can operate in space for very long periods of time. When NASA sent the robotic explorers Spirit and Opportunity to Mars in 2003, they were expected to survive ninety days. More than six years later, these helpful robots were still sending useful data back to Earth.