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The Cassini spacecraft currently orbiting Saturn has provided us with a wealth of discoveries. It’s mapped the surface of Titan, studied the age of Saturn’s rings, and found liquid water on Enceladus. But because it actively sends and receives radio transmissions to and from Earth, it’s position and movement can be tracked with extraordinary precision. Using the telemetry of Cassini, we’ve been able to determine the position of Saturn to within a mile. That level of precision also means the gravitational influence of other planets and moons can be measured by Cassini, and it may have felt the gravitational pull of the yet undiscovered ninth planet.
