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Tiny circumstances shape planetary evolution
The size and composition of planets like Mercury, Venus, Earth, and Mars are largely influenced by small details and circumstances. For instance, Mercury's small size and large iron core are attributed to a giant impact early in its history. The difference between Venus and Earth's surface environments is explained by Venus being slightly closer to the sun, leading to a runaway greenhouse effect. Mars, which is smaller than planetary formation models predict, is believed to have been affected by Jupiter's disruptive influence during its formation. Each planet's evolution is determined by individual circumstances and factors present in their vicinity.