Craters on the Moon
This gorgeous photo of the Moon was taken by the astronauts of Apollo 8. Two of the Moon's most recognizable craters are clearly visible: The dark-floored crater in the lower right is the Lomonosov crater, measuring about 80 kilometers (50 miles) in diameter. The bright-rayed crater is Giordano Bruno, about 21 kilometers (13 miles) in diameter.
Photograph courtesy NASA