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The waterhole refers to an especially quiet section of the electromagnetic spectrum between 18 and 21 centimeters. Hydroxyl radiates at 18 centimeters, and hydrogen at 21 centimeters; those two combined form water, and as water is currently thought to be essential to extraterrestrial life advanced enough to generate radio signals, the waterhole is a frequent target of investigation.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Waterhole_(radio)". A list of authors is available in Wikipedia.