In recent years, evidence suggests that there might be something lurking on the outskirts of the Solar System – something large, and possibly very dark.
. In many other cases, the planet's gravity snared passing rocks and kept them, like weird little rock-collecting goblins.
Chan calculated the probability that the putative planet could have picked up some satellites, and found that it would be more peculiar if it hadn't. According to his calculations, on average, an object the mass of Planet Nine should capture 20 trans-Neptunian objects as large as or larger than 140 kilometers across.
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