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Planet X has never been seen - largely because it does not exist.

The term "Planet X" originally referred to a hypothetical planet that lay beyond the orbit of Neptune. Due to what seemed to be irregularities in the orbit of Uranus and Neptune, astronomers, such as Percival Lowell, theorized that yet another large planet must lay even further out, causing the anomaly. The later discovery of Pluto seemed to justify the idea, but it was eventually determined to be too small to affect the gas giants. Data from the Voyager 2 mission finally put the idea of Planet X to rest when it was shown that the seeming anomalies in the orbits were due to astronomers underestimating how large Neptune was.

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13y ago

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