Exoplanet around Alpha Centauri is nearest-ever

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Astronomers have found the nearest planet outside our Solar System, circling one of the stars of Alpha Centauri just four light-years away. The planet has at minimum the same mass as Earth, but circles its star far closer than Mercury orbits our Sun. It is therefore outside the "habitable zone" denoting the possibility of life, as the researchers report in Nature. However, studies on exoplanets increasingly show that a star with one planet is likely to have several. At the very least, the work answers the question first posed in ancient times about…

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