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Venus Transit 2012: An Observer's Guide (Infographic) |

Stashed in: The Universe, Infographics!, Venus!

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Venus transits occur in pairs that are eight years apart, but these dual events take place less than once per century. The last one happened in 2004, and the next won't come until 2117.

"Only six such events have occurred since the invention of the telescope," said astrophysicist Sten Odenwald, of NASA's Goddard Space Flight Center in Greenbelt, Md., in a statement.

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