Astronomers from Princeton may have found evidence of a hidden planet -- Planet Y -- orbiting in the far reaches of the Solar System. Could this be the missing world shaping the Kuiper Belt? Watch to find out. A New Planet Discovered? Planet 9 Has a Rival -- Meet Planet Y | 9:45 NASA Space News | 556K subscribers | 28,062 views | October 6, 2025 Chapters: 00:00 Introduction 00:38 The Discovery 03:04 Scientific Importance and Theories 05:30 Implications and What’s Next 08:29 Outro 08:43 Enjoy