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Flag, Ladder, and Laser Reflector
The laser reflector is an array of 'corner cubes' which, when properly
positioned on the lunar surface, can reflect short laser pulse back to
Earth and allow a very accurate measurement of the distance between the
telescope that sent to pulse and the reflector. The three arrays
left on the Moon - one each by the Apollo 11, 14, and 15 crews - have
provided invaluable data for the study of such things as plate
tectonics on Earth and the General Theory of Relativity. As of
2009, they are still in use.
The large version is a 14 Mb tiff file.
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