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The Nemesis theory hasn’t been disproven, but there’s no compelling evidence for it, either. The basic idea is that a brown dwarf massing 10-100 Jupiters is in a slow, wandering orbit around our sun somewhere on the fringes of our solar system, far beyond Pluto/Neptune. Every once in a long while it plows through the Oort cloud, knocking vast numbers of iceballs around, sending many of them tumbling towards the sun as new comets, and triggering one of the periodic mass extinctions we’ve observed in the geological record.
The Planet X theory is, shall we say, less accepted. |
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