Predictions and tests are the central themes of Science. Theories make predictions. Observations test the predictions. If new data falsifies a theory, then the theory either must be modified to account for the new data or it must be discarded.

Our theory for Sedna's orbit predicts that we should find other distant objects with orbits similar to Sedna's. We also predict that there should be some closer objects with orbits that are much more highly inclined than Sedna to the ecliptic, the plane of the Earth's orbit.

Although there are too few objects to provide a great test of the theory, at least one other object has an orbit similar to those we predicted.

Lynne Allen and her collaborators discovered 2004 XR₁₉₀, an object with a heliocentric distance of 57 AU and an inclination of 47 degrees.