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Originally posted by michael1983l
Not so long back there was always a thread talking about strange rumbling sounds coming from the sky. Has this phenomenon now ceased to be or have people just stopped reporting it? This is a very interesting subject in my opinion because there is a variety of things we can attribute this too. The most outlandish theory would be that it is caused by alien ships, but I am more inclined to believe it is caused by atmospheric effects of some kind.
Did we ever get to the bottom of this?