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The experiment, called GOPEX (Galileo Optical Experiment), is demonstrating a laser "uplink" from Earth to spacecraft. Laser "downlinks" may be used in the future to send large volumes of data from spacecraft to Earth.
reply to post by Soylent Green Is People
LADEE has a communications laser on board. They've already used it to send data back at a rate of 622 megabits per second.