‘Planet Nine’ cousin found | Live Science

An enormous exoplanet found circling a double star 336 light-years away may provide clues to a mystery closer to home. 

In the far reaches of the solar system, out beyond Neptune, exists a cluster of icy celestial objects known as extreme trans-Neptunian object that move in unexpected ways. Some astronomers think these objects are responding to the gravitational pull of a yet-unobserved planet, known as Planet Nine, which orbits very, very far away. Others think the weird objects are responding to the cumulative pull of other small objects, not to one large planet. 

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