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Jonathon Amos tells us about the discovery of an Earth-sized exoplanet which has been found to be orbiting our nearest star, Proxima Centauri. It is the closest Earth-sized exoplanet found to date - our astronomical next door neighbour, making this discovery arguably the most exciting exoplanet discovery to date. (Photo © ESO/M. Kornmesser, Artists impression of Proxima b (issued by the European Southern Observatory)