Mercury - The planet closest to the sun, Pluto - A dwarf planet, 365 and a quarter - The number of days in a year, The moon - A natural satellite of the earth, Saturn - The planet with rings, Copernicus - The scientist who developed the heliocentric model of the solar system, Seasons - We experience these because the earth is tilted, Day and night - We experience these because the earth spins on its axis,

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