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A new salvo has been fired in the back-and-forth debate about the existence of Planet Nine. In 2014, astronomers Scott Sheppard and Chadwick Trujillo suggested that a giant unseen "perturber" may lurk in the far outer solar system. The duo based this hypothesis on peculiarities in the orbits of the dwarf planet Sedna, the newfound object 2012 VP113 and several other bodies beyond the orbit of Neptune (trans-Neptunian objects, or TNOs). The case grew in January 2016, when astronomers Konstantin Batygin and Mike Brown found evidence that the orbits of additional TNOs had been sculpted. Batygin and Brown dubbed the hypothetical perturber "Planet Nine" and calculated that, if the world exists, it's likely about 10 times more massive than Earth and lies perhaps 600 astronomical units (AU) from the sun. (One AU is the average Earth-sun distance — about 93 million miles, or 150 million kilometers.) Then, last summer, Sheppard and Trujillo found two new TNOs that Planet Nine may have tugged on, increasing the number of possibly affected bodies yet again.