Close encounter with alien star could explain ’Oumuamua, debunk Planet Nine
Our solar system has several belts of rocky planetesimals that are essentially the crumbs left over from the formation of the planets and moons. But new research suggests some of these objects could actually be alien, captured during close flybys with other star systems. These close encounters could also explain objects like 'Oumuamua and might even provide an alternative to the "Planet Nine" hypothesis.
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