NASA beams Mona Lisa to Moon with laser
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Each pixel was transmitted by a laser pulse, with the pulse being fired in one of 4,096 possible time slots during a brief time window allotted for laser tracking. The complete image was transmitted at a data rate of about 300 bits per second.
The laser pulses were received by LRO's LOLA instrument, which reconstructed the image based on the arrival times of the laser pulses from Earth.
This was accomplished without interfering with LOLA's primary task of mapping the Moon's elevation and terrain.