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This Concept Map, created with IHMC CmapTools, has information related to: Mercury and the Moon v2, How are Mercury and the Moon similar? How are they different and why? Differenes Orbit, How are Mercury and the Moon similar? How are they different and why? Differenes Size, Atmosphere - both have essentially no atmosphere So They have very variable temperatures, Have no plate tectonics, a single plate Therfore The surface is old - not much movement, Are very cratered Why? Atmosphere - both have essentially no atmosphere, Mercury: thick rocky mantle and very large iron-rich core , Moon: Earth-like, crust, mantle, layers, small iron-rich core Iron Core Magnetic fields: Mercury has a weak magnetic field, but stronger than the Moon's, Average Distance from the Sun i.e. Moon: 1AU, Mercury: 0.387 AU, Surface Both Have no plate tectonics, a single plate, Moon (3344kg/m3) is less dense than Mercury (5430kg/m3) Thus Gravity: Mercury:0.38, Moon:0.17, How are Mercury and the Moon similar? How are they different and why? Differenes Rotation, Moon: 1AU, Mercury: 0.387 AU Thus Mercury has much higher temp, Rotation Tilt Moon = 1.54 degrees, Mercury = virtually nil, How are Mercury and the Moon similar? How are they different and why? Differenes Interior, Interior Consists of Mercury: thick rocky mantle and very large iron-rich core , Moon: Earth-like, crust, mantle, layers, small iron-rich core, Surface Both Are very cratered, Rotation Tidal Locking Mercury: not synchronous: three rotations in axis for every two Sun-orbits, Moon: Synchronous: one axis rotation in one Earth-orbit, Orbit Object The Moon orbits Earth, Mercury orbits the Sun, The surface is old - not much movement And so Are very cratered, They have very variable temperatures i.e. Mercury:350°C to -170°C. Moon:130°C to -180°C, Size Diameter Moon (3476km) is much smaller than Mercury (4880km)