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Upsweep is an unidentified sound detected on the American NOAA's equatorial autonomous hydrophone arrays. This sound was present when the Pacific Marine Environmental Laboratory began recording its sound surveillance system, SOSUS, in August 1991. It consists of a long train of narrow-band upsweeping sounds of several seconds in duration each.
Unidentified sounds (11 P) U. Unidentified flying objects (5 C, 8 P) W. ... Pages in category "Unexplained phenomena" The following 32 pages are in this category, out ...
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The claws-strophobic clip showed homeowner Lacy Day and several men cutting away a square panel of plasterboard to reveal the “source of the noise” in their wall. The wall eventually came down ...
Since this still lacks scientific confirmation, rampant speculation continues about potential extra-terrestrial theories for these "trumpet noises." But don't count NASA as a UFO-doubter just yet.
An mysterious signal recorded by an Ohio State University astronomer in 1977 is getting a fictional explanation thanks to "3 Body Problem."
Considered an urban myth, the name is a metonym for the common color of human faeces. Attempts to demonstrate the existence of a "brown note" using sound waves transmitted through the air have failed. Frequencies supposedly involved are between 5 and 9 Hz, which are below the lower frequency limit of human hearing. High-power sound waves below ...
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