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An artist’s illustration of the K2-138 system, which contains at least five “sub-Neptune” planets orbiting closely around their parent star. (Image credit: R. Hurt (IPAC)/NASA/JPL-Caltech)
An artist’s illustration of the K2-138 system, which contains at least five “sub-Neptune” planets orbiting closely around their parent star. (Image credit: R. Hurt (IPAC)/NASA/JPL-Caltech)