<P> The ongoing Lunar Laser Ranging Experiment measures the distance between Earth and the Moon using laser ranging . Lasers on Earth are aimed at retroreflectors planted on the Moon during the Apollo program ( 11 , 14 , and 15 ) and the two Lunokhod missions . The time for the reflected light to return is measured . </P>
<P> The ongoing Lunar Laser Ranging Experiment measures the distance between Earth and the Moon using laser ranging . Lasers on Earth are aimed at retroreflectors planted on the Moon during the Apollo program ( 11 , 14 , and 15 ) and the two Lunokhod missions . The time for the reflected light to return is measured . </P>
what three apollo missions left reflectors on the moon
what three apollo missions left reflectors on the moon
11 , 14 , and 15
11 , 14 , and 15