Photos: Transit of Venus a once-in-a-lifetime astronomical event
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Credit: Getty Images
LONDON - JUNE 8: The planet Venus is visible as a black dot as it transits across the face of the sun as seen from the Greenwich Observatory June 8, 2004 in London. The rare astronomical event last occurred in 1882, while the next transit is due in 2012. (Photo by Ian Waldie/Getty Images)
