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Unformatted text preview: Maria formed Essentially geologically dead - 3 billion years ago Mercury Mass = 0.055 Earth's Radius = .38 Earth's Density = 5400 Kg/m^3 [5.4 kg/liter ] Unusual motion - resonance rotation Interior - cool, iron-rich core Surface features: Caloris Basin - large impact crater Jumbled terrain - unusual hilly formation on opposite side of the planet from Caloris Basin Intercraterplains - smoothed surface regions possibly from lava flow covering the craters in that region Scarps. - Huge cliffs thought to have form as the planet cooled and contracted. No atmosphere Average temperature: 440 K (167 C) (590-725 K, sunward side) Weak magnetic field Probe: Mariner 10...
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- Fall '08