Waterhole (radio)
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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.
[edit] External links
- "waterhole" entry in the The Encyclopedia of Astrobiology, Astronomy, and Spaceflight'
- "The ABCs of SETI: the search for extraterrestrial intelligence"
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