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Associated Press
This map provided by NASA shows the visibility for the transit of Venus passes in front of sun. Venus crosses the sun on Tuesday, June 5, 2012, from the Western Hemisphere (Wednesday, June 6 from the Eastern Hemisphere). Known as a transit of Venus, this won't happen again until 2117. The transit is happening during a 6-hour, 40-minute span starting after 6 p.m. EDT in the United States.  (AP Photo/NASA)

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