Pluto failed the third criterion, as its orbit overlaps with the Kuiper Belt, leading to its demotion to a dwarf planet. Historical Searches and the Planet X Hypothesis The search for a distant planet, often referred to as Planet X, began in the early 20th century with Percival Lowell's observations.
Ongoing Planet X Solar System Search Continues
The Dark Energy Survey, originally designed to study galaxy clusters, has also proven adept at spotting distant solar system objects. The hypothetical concept of a 10th planet in our solar system has captivated the imagination of astronomers and the public alike for decades.
The modern hypothesis of a Planet X or Planet Nine, however, is based on more rigorous analysis of extreme trans-Neptunian objects (TNOs) that cluster in a specific region of the solar system, suggesting a gravitational shepherd much larger than Pluto. Evidence from Distant Objects Key evidence for a potential 10th planet comes from the peculiar orbits of certain TNOs.
Ongoing Search for Planet X in Our Solar System
While the official count remains at eight planets since the reclassification of Pluto, the search for worlds beyond Neptune continues to drive cutting-edge astronomical research. Proposed Designation Common Name Estimated Mass Orbital Period (approx.
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