The Hunt for Planet 9 Just Got Serious

Is Planet 9 real? Somewhere beyond Pluto, astronomers believe a massive hidden planet may be pulling on distant objects in the Kuiper Belt. In this video, we explore the evidence for Planet 9, the mysterious “Phantom Pull,” the new 2025 infrared candidate, and how the Vera C. Rubin Observatory could finally solve one of the biggest mysteries in our solar system.

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A Cosmoknowledge production.

Graphics:
Rubin observatory
ScienceMagazine
Astrokobi/Startalk/PowerJRE
VIOI/Territory/Ted
Caltech
NASA

Music:
Code of Violence
Backspace
Impossible Theory
Mindscape
Radar Focus
Estimations

Research papers:
1. Evidence for a Distant Giant Planet in the Solar System
Batygin & Brown, 2016. This is the original major Planet Nine paper, arguing that distant Kuiper Belt objects show orbital clustering that could be explained by a massive unseen planet.
Link: https://arxiv.org/abs/1601.05438
2. A Search for Planet Nine with IRAS and AKARI Data
Phan et al., 2025. This is the recent infrared search paper using IRAS and AKARI data 23 years apart and finding one candidate that still needs follow-up observations.
Link: https://arxiv.org/abs/2504.17288

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