On December 16, 1992, 8 days after its encounter with Earth, the Galileo
     spacecraft looked back from a distance of about 6.2 million kilometers (3.9 mil-
     lion miles) to capture this remarkable view of the Moon in orbit about Earth. The
     composite photo- graph was constructed from images taken through visible (violet,
     red) and near- infrared (1.0-micron) filters. The Moon is in the foreground; its
     orbital path is from left to right. Brightly colored Earth contrasts strongly with the
     Moon, which reacts only about one-third as much sunlight as our world. To
     improve the visibility of both bodies, contrast and color have been computer
     enhanced. At the bottom of Earth's disk, Antarctica is visible through clouds. The
     Moon's far side can also be seen. The shadowy indentation in the Moon's dawn
     terminator--the boundary between its dark and lit sides--is the South Pole-Aitken
     Basin, one of the largest and oldest lunar impact features. This fea- ture was studied
     extensively by Galileo during the first Earth flyby in December 1990.