Images from the Solar Dynamics Observatory
Here's a link to a "video and music" compilation celebrating the Venus Transit 2012. You can use the NASA app on an iPad or go to the Youtube clip on a desktop/laptop. The images show Venus against a backdrop of the Sun using a variety of filters. Students gain a sense of scale, especially considering that Venus is about the same size as the Earth. Stunning images. Moving music.
"On June 5 2012, the Solar Dynamics Observatory(a spacecraft launched in 2010 to study the Sun) collected images of the rarest predictable solar event--the transit of Venus across the face of the sun. This event happens in pairs eight years apart that are separated from each other by 105 or 121 years. The last transit was in 2004 and the next will not happen until 2117."