The Proxima Centauri exoplanet, unlike Earth, is tidally locked to its parent star, always showing it the same face. (Like our Moon!)
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Replying to @NASAWebb
Q: How can astronomers tell that the PC exoplanet is tidally locked at such a vast distance?
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Replying to @frozencanuck
It's likely for a planet so close to its parent star to be tidally locked.
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