1 of 15Image
Update: On June 5 and 6, weather and location permitting, citizens of Earth were able to see a solar event that won't be repeated until 2117 - the transit of Venus. Similar to an eclipse, a transit occurs when a planet or other object moves between the sun and Earth.
Here, the transit of Venus has almost begun.
Venus appears to be a spot on the sun as it appears to fly over the sun's surface in this image taken by NASA's Solar Dynamics Observatory (SDO).