Launched on May 18, 1969, the Apollo 10 lunar mission sent three men, Thomas P. Stafford, John W. Young, and Eugene A. Cernan, into orbit around the moon, the first mission in history to do so. When their command module, nicknamed "Charlie Brown", orbited to the far side of the moon, communication with Earth was impossible, since the moon readily blocked radio transmissions. However, in place of mission control’s far away voice, the crew instead picked up on a mysterious transmission, according to a new documentary.
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