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By coupling semi-analytic models of galaxy formation to a recipe that relates the occurrence of planets to the mass and metallicity of their host stars, we trace the population of terrestrial planets around both solar-mass (FGK type) and lower-mass (M dwarf) stars throughout all of cosmic history. We find that the mean age of terrestrial planets in the local Universe is $7\\pm{}1$ Gyr for FGK hosts and $8\\pm{}1$ Gyr for M dwarfs. 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Benson, A. Johansen, E. Zackrisson, J. Gonzalez, M. Janson, P. Calissendorff","submitted_at":"2016-02-01T21:00:04Z","abstract_excerpt":"The study of cosmology, galaxy formation and exoplanets has now advanced to a stage where a cosmic inventory of terrestrial planets may be attempted. By coupling semi-analytic models of galaxy formation to a recipe that relates the occurrence of planets to the mass and metallicity of their host stars, we trace the population of terrestrial planets around both solar-mass (FGK type) and lower-mass (M dwarf) stars throughout all of cosmic history. We find that the mean age of terrestrial planets in the local Universe is $7\\pm{}1$ Gyr for FGK hosts and $8\\pm{}1$ Gyr for M dwarfs. 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