NASA's Solar Dynamics Observatory (SDO) spacecraft took this image showing the Sun being partially blocked by Earth on September 6, 2012. Twice a year, for three weeks near the equinox, NASA's Solar Dynamics Observatory (SDO) moves into its eclipse season – a time when Earth blocks its view of the sun for a period of time each day. The Solar Dynamics Observatory (SDO) is a NASA mission which will observe the Sun for over five years. (Photo by Reuters/NASA/SDO/Handout)
