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A stellar visitor left its mark: Astronomers have discovered that our solar system was once visited by an alien star that significantly altered the trajectories of some comets and ice floes! And although the "troubled star" had an extremely low mass, it was still enough to stir up objects in the Oort cloud. But what led to the sparkling uninvited guest ending up in our solar system in the first place? Where is the star today - and what lessons can we learn from this cosmic encounter? #TheSimplySpaceRU