A large moon might be hugging an object in the outer solar system


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An artist’s impression of the object known as 2002 TC302

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An object on the outer edges of the solar system may have a large moon orbiting it at an unusually close distance. The find could help explain how such binary objects evolved.

José-Luis Ortiz at the Institute of Astrophysics of Andalusia in Spain and his colleagues observed the previously discovered object, known as 2002 TC302, in January 2018 when it eclipsed a distant star, casting a shadow on Earth and allowing its properties to be studied.

From 12 separate observations, the researchers deduced that the …



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