Are these strange sounds the aural equivalent of visual displays of 'northern lights'?
Two separate video recordings made in Michigan on the night of 5 November 2013 picked up more of these 'strange sky sounds' that people the world over have been hearing. Note how in this first video, the witness is confused as to where the sound is coming from, then eventually settles on it 'coming from the sky', while the witness in the second video describes the ground beneath his feet shaking, suggesting the sound was coming from below.

From as far back as 2008, video recordings of strange and disturbing noises have been appearing on the internet. In the last two years, many more of these 'strange noise' videos have been recorded and uploaded by people from many different parts of the globe.

The precise origin and meaning of this phenomenon is, as yet, unknown. Are we dealing with a cosmic version of the 'bell tolling' for life on planet earth, or is there a more mundane explanation?

The Sott Report investigates: