Astronomers have found an Earth-like planet orbiting the closest star to our Solar System, Proxima Centauri. This next-door planet is warm enough for liquid water, is almost certainly rocky and terrestrial, and could even have an atmosphere. It's named Proxima B.

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Astronomers have found an Earth-like planet orbiting the closest star to our Solar System, Proxima Centauri. This next-door planet is warm enough for liquid water, is almost certainly rocky and terrestrial, and could even have an atmosphere. It's named Proxima B.