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Planet nine mystery deepens as new discovery challenges hidden planet theory

Latest Science News -- ScienceDaily·June 9, 2026

Astronomers have been searching for a hidden giant planet beyond Neptune, driven by unusual orbits among Kuiper Belt objects. Recent discoveries, however, are challenging the Planet Nine theory by revealing more stable motion than expected. The existence of Planet Nine is still possible, but it may be located much farther away than initially thought. This new information deepens the mystery surrounding the potential hidden planet.

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