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New dwarf planet spotted at the edge of the solar system

New ScientistThursday, May 22, 2025 at 8:00:23 PM
New dwarf planet spotted at the edge of the solar system
Astronomers have discovered a small, distant object called 2017 OF201 lurking at the solar system's edge—likely a new dwarf planet. What makes it interesting isn’t just its existence, but its wonky orbit, which throws cold water on the long-standing theory that a mysterious "Planet X" might be hiding out there.
Editor’s Note: The hunt for Planet X has been a tantalizing space mystery for years, with some scientists convinced a massive unseen planet is tugging on other objects’ orbits. This discovery suggests the weird movements of distant space rocks might just be… well, weird, without needing a hidden giant to explain them. It’s a reminder that the solar system still has surprises—even if they’re not the ones we expected.
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