BBC Sky at Night

Is another Earth-sized planet hiding in the Solar System?

CUTTING EDGE

Our experts examine the hottest new research

The trans-Neptunian objects (TNOs) are icy bodies orbiting in the dark, outer recesses of the Solar System beyond the orbit of Neptune. In recent years, astronomers have noticed a number of oddities about the orbits of some TNOs, which cannot easily be explained by any single current model of

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