For serious discussion of the controversies, approaches and enigmas surrounding the origins and development of the human species and of human civilization. (NB: for more ‘out there’ posts we point you in the direction of the ‘Paranormal & Supernatural
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It certainly wouldn't be out of the question for our sun to have a companion star. Such binary systems seem to be very common throughout the galaxy. If it's true, then perhaps Sirius sometimes perturbs the Oort cloud, causing comets to hurtle into the inner solar system and bringing disaster to the planets they encounter.