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Mysterious Gravitational Tug on Orbiter May Help Find Planet Nine

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Planet Nine

Artist's impression of Planet Nine as an ice giant eclipsing the central Milky Way, with a starlike sun in the distance. Neptune's orbit is shown as a small ellipse around the sun.

Credit: Tomruen/Wikimedia Commons, CC BY-SA 4.0

The hunt is on to find "Planet Nine"—a large undiscovered world, perhaps 10 times as massive as Earth and four times its size—that scientists think could be lurking in the outer solar system.

From Scientific American
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