Venus Transit: Explaining a Rare Phenomenon

Aired: 6/4/2012 | 0:05:07 | Clip
The second of a pair of rare astronomical events will occur Tuesday evening as Venus will make its way across the face of the sun for the last time until December 2117. Edward Murphy, associate professor of astronomy at the University of Virginia, delves into the science behind the Transit of Venus, why they are so rare, and their significance not only in the past, but for the future.