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    Dedication of a plaque at Lick's Shane Telescope on August 1 honors the Lunar Laser Ranging Experiment that measured the distance to the moon 50 years ago. By Tim Stephens. The first precise measurement of the distance from Earth to the moon was achieved on August 1, , in a landmark experiment involving Lick Observatory astronomers and the Apollo 11 astronauts. To commemorate this achievement on its 50th anniversary, a bronze plaque in the lobby of the Shane Telescope Dome at Lick Observatory will be dedicated on Thursday, August 1, as part of the IEEE Milestones Program , which honors significant technical achievements and innovations in electronics and computing. The event is by invitation only due to space limitations. Researchers used Lick's inch Shane Telescope to fire a powerful laser at the moon and detect the light that bounced back from a retro-reflector array placed on the lunar surface by the Apollo 11 astronauts.
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    One Apollo 11 Experiment Is Still Going 50 Years Later

    The laser pulse traveled to the moon and returned after reflecting off a 1-meter-wide array of mirrors—retroreflectors—that Apollo 11 astronauts had placed on the lunar surface 12 days earlier. In the five years that followed that experiment, other missions, such as Apollo 14 and 15 in , placed additional mirror arrays on the surface. When planning the Apollo 11 mission to the moon, NASA researchers decided to perform a few experiments. The LURE was meant to investigate fundamental aspects of gravitation.
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    Lick Observatory commemorates Apollo 11 experiment on 50th anniversary

    Forty years ago, Lick Observatory scientists helped make history when they teamed up with Apollo 11 astronauts to determine the distance from Earth to the moon with unprecedented accuracy. Using a powerful laser installed at the observatory and a sophisticated reflector placed on the moon, Lick astronomers were able to time the round trip of a beam of light and calculate the distance. The experiment atop Mount Hamilton outside of San Jose was the culmination of many months of preparation that included excavating a major pit under the inch telescope inside the observatory. The team installed two lasers and optical equipment to shoot a beam of light up through the telescope, as well as light-detecting equipment and an advanced timer to record the precise instant when the beam returned to earth.
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