First Radar Echos From The Moon

First Radar Echos From The Moon

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Photograph representing the first radar echoes received from the moon using the Naval Research Laboratory 50-foot radio telescope at wavelengths as short as 10 centimeters and pulse lengths as short as 1/2,000,000th of a second. This work showed that the distance from the earth to the moon is 384,400.2 plus or minus 1.1 kilometers.
Currently not on view
Object Name
overall: 12 in x 9 1/2 in; 30.48 cm x 24.13 cm
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Medicine and Science: Physical Sciences
Data Source
National Museum of American History
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