Scientists have discovered a lonely orphaned planet wandering through the Milky Way with no parent star to guide it — a "rogue" planet, stuck in endless darkness with no days, nights, or gravitational siblings to keep it company. It's possible our galaxy is filled to the brim with these rogue planets, but this one is particularly unusual for one special reason: it is the smallest found to date — even smaller than Earth — with a mass similar to Mars.
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