RUSSELL CROMAN / SCIENCE PHOTO LIBRARY RUSSELL CROMAN / SCIENCE PHOTO LIBRARY
Lunar reflector sites. Diagram indicating the locations of the five laser reflectors on the Moon as part of the Lunar Laser Ranging Experiment. These were left behind after the Apollo 11 (July 1969), Lunakhod 1 (November 1970), Apollo 14 (January 1971), Apollo 15 (July 1971) and Lunakhod 2 (January 1973) Moon landings. The reflectors allow the distance from the Earth to the Moon to be measured. Lasers from Earth are aimed at the reflectors and the time delay for the reflected light to return to Earth is used to determine the distance with great accuracy.
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