PHILIPPE PLAILLY / SCIENCE PHOTO LIBRARY PHILIPPE PLAILLY / SCIENCE PHOTO LIBRARY
Lasers in space science. View of two laser beams used for distance measurements. The horizontal beam is used to measure the distance from the Earth to the Moon, which is the bright spot at far left, giving results with an accuracy of 3 centimetres. The vertical beam is used in measurements of the distance of Earth-orbiting satellites, either in geodynamics or for accurately aligning satellite imaging systems. Photographed at the Observatory of the Cote d'Azur, near Grasse in southern France.
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