Artemis Program

Is there a hidden 'Planet 9' in our solar system?

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By system
September 14, 2026 • 44 views
Original source: Space.com
Is there a hidden 'Planet 9' in our solar system?

For more than a century, astronomers have been captivated by the idea that an undiscovered planet could be lurking in the furthest reaches of our solar system.

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