Waterhole (radio)
From Wikipedia, the free encyclopedia
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 centimers; 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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