This distant Earth-sized world stays in perpetual darkness on one side
The exoplanet TRAPPIST-1f is tidally locked to its star, meaning one hemisphere remains in permanent, freezing darkness while the other faces a never-ending day.
Located 40 light-years away, TRAPPIST-1f is an Earth-sized planet that orbits its cool red dwarf star so closely that gravitational forces have locked its rotation. This phenomenon, known as tidal locking, creates a world of extremes where one side never sees the sun.
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