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At just over four light years distant, Proxima Centauri is the closest star to the Sun in the entire Universe. We know it has one planet, called Proxima b, and there's decent evidence of a second, called Proxima c.

A team of astronomers has announced there might be a third planet, now too! If confirmed it will be called Proxima d, and would be one of the smallest and lowest-mass exoplanets ever found.

Yeah, this may be a big deal. ....

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