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In 2004, astronomers spotted a planet-like object orbiting Fomalhaut, one of the brightest stars in the night sky. With further observations, however, it started to look more like a dust cloud—a decidedly less exciting outcome. Astronomers have now made an unexpected second observation around the same star: an apparent collision of two gigantic planetesimals—a decidedly incredible and important finding.
Paul Kalas, who discovered the ex-exoplanet, has been tracking Fomalhaut since…
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