Plaques were left on the moon by the Apollo NASA astronauts...

http://en.wikipedia.org/wiki/Lunar_plaque
AND
http://fcit.coedu.usf.edu/florida/photos/nasa/people/people30.htm
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Apollo 10 Command Module seen at the Science Museum



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Apollo 11 Plaque
HERE MEN FROM THE PLANET EARTH,
FIRST SET FOOT UPON THE MOON JULY 1969 A.D.,
WE CAME IN PEACE FOR ALL MANKIND.
http://upload.wikimedia.org/wikipedia/commons/f/f9/Apollo11Plaque.jpg
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Apollo 12 Plaque
NOVEMBER 1969
http://upload.wikimedia.org/wikipedia/en/5/50/A12-plaque.jpg
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Apollo 13 Plaques (NEVER MADE IT TO THE MOON)
Aquarius. April 1970
http://upload.wikimedia.org/wikipedia/en/6/6b/A13-plaque.jpg
The plaque intended for the Apollo 13 is in the possession of Astronaut Jim Lovell who was to have placed it over the original plaque on the Lunar Module as it had the wrong name on!
It bore the name of Astronaut Mattingly who was replaced by Astronaut Swigert before the mission launch.
However, this could not be done as the lunar landing was aborted.
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Apollo 14 Plaque
ANTARES
FEBRUARY 1971
http://upload.wikimedia.org/wikipedia/en/b/bf/A14-plaque.jpg
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Apollo 15 Plaque
FALCON
JULY 1971
http://upload.wikimedia.org/wikipedia/en/9/9e/A15-plaque.jpg
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Apollo 16 Plaque
ORION
APRIL 1972
http://upload.wikimedia.org/wikipedia/commons/d/d0/A16-plaque.jpg
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Apollo 17 Plaque
HERE MAN COMPLETED HIS FIRST EXPLORATIONS OF THE MOON
DECEMBER 1972 A.D.
MAY THE SPIRIT OF PEACE IN WHICH WE CAME
BE REFLECTED IN THE LIVES OF ALL MANKIND
http://upload.wikimedia.org/wikipedia/en/e/e8/Apollo17_plaque.jpg
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See...
http://www.space.com/news/a11_plaque.html
and
http://antwrp.gsfc.nasa.gov/apod/ap950922.html
For more information on the moon see our online Observatory Page.........
http://www.windowonwoking.org.uk/sites/goldsworthparkcommunityassociation/GoldsworthNews/144
(All photos on this page Copyright GPCA/A. Jones)