Word: atmosphereless
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Dates: during 1970-1979
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...They have been keeping track of signals from extremely sensitive devices left behind at the Apollo landing sites and capable of detecting positive ions, atoms or molecules carrying a positive electrical charge. On at least three occasions, the scientists say, the detectors registered activity that was unusual on the atmosphereless moon: clouds of gases were passing by. Analyzing the data, the scientists determined that the gases had the unmistakable characteristics of ionized water vapor...
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