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Why Venus Remains A 'Mysterious Planet'

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Planet Venus, pictured as a black dot, left, is seen in transit across the sun on the banks of the Ganges River in Varanasi, India, Wednesday, June 6, 2012. (Rajesh Kumar Singh/AP)
Planet Venus, pictured as a black dot, left, is seen in transit across the sun on the banks of the Ganges River in Varanasi, India, Wednesday, June 6, 2012. (Rajesh Kumar Singh/AP)

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