Sonogram of the "Bloop," an ultra-low-frequency sound detected in the Pacific Ocean in 1997. The image shows the sound's frequency and intensity over time. The origin of the Bloop remains a mystery, with theories ranging from unusual biological activity to geological events. The bright vertical lines represent the sound's intensity.

Astronomy Picture from 27/04/2010

The Bloop: A Mysterious Sound from the Deep Ocean

Source: https://apod.nasa.gov/apod/ap100427.html


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