Nicholas, there is no planet X. Nancy and her followers are crazy. They have zero credability. Nothing is going to crash into Earth, or make a pass at Earth or cause any cataclysmic changes to Earth. Remain Calm. If you are easily excitable, do not read websites like that. They are full of (at best) psuedoscience and mumbo jumbo.

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Hwæt! We Gardena in geardagum,
þeodcyninga, þrym gefrunon,
hu ða æþelingas ellen fremedon.