The top photograph is known as "The Blue Marble" and was taken at a distance of 28,000 miles as the Apollo 17 crew approached the moon on December 7, 1972. ( The bottom image is a composite view of the Earth using Suomi NPP satellite imagery taken between April 18 and October 23, 2012 and was released on December 3, 2012. NASA calls it "The Black Marble." (