Venus makes its way across the Sun.
Venus (top right) begins to cross the sun’s face during the transit of Venus June 5, 2012 as seen from the west side of Manhattan in New York. Astronomers around the world are training their telescopes on the skies to watch Venus pass in front of the Sun, a once-in-a-lifetime event that will not be seen for another 105 years. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/GettyImages)