One type of data currently collected as a direct result of theApollo Program is the Lunar Laser Ranging Experiment. The ongoingLunar Laser Ranging Experiment measures the distance between theEarth and the Moon using laser ranging. Lasers on Earth are aimedat retroreflectors planted on the Moon during the Apollo program(11, 14, and 15), and the time for the reflected light to return isdetermined.