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Mass (kg) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.42 x 10^23 Diameter (km) . . . . . . . . . . . . . . . . . . . . . . . . . . 6787 Mean density (km/m^3) . . . . . . . . . . . . . . . . . . . . . . 3940 Escape velocity (m/sec) . . . . . . . . . . . . . . . . . . . . . 5000Distance from the sun . . . . . . . . . . . . . . . . . . . . . . Shortest-128,400,000 mi.(206,600,000 km.) Greatest-154,800,000 mi.(249,200,000 km.) Mean-141,000,000 mi.(227,900,000 km.) Rotation period (length of day in Earth days) . . . . . . . . . . 1.026 Revolution period (length of year in Earth days) . . . . . . . . . 686.98
Obliquity (tilt of axis in degrees) . . . . . . . . . . . . . . . 25 Orbit inclination (degrees) . . . . . . . . . . . . . . . . . . . 1.85 Orbit eccentricity (deviation from circular) . . . . . . . . . . . 0.093
Mean surface temperature(Fahrenheit) . . . . . . . . . . . . . . . -225 to 63 F
Visual geometric (reflectivity) . . . . . . . . . . . . . . . . . 0.15 Highest point on surface . . . . . . . . . . . . . . . . . . . . . Olympus Mons (about 24 km above surrounding lava plains) Atmospheric components . . . . . . . . . . . . . . . . . . . . . . 95% carbon dioxide 3% nitrogen 1.6% argon Surface materials . . . . . . . . . . . . . . . . . . . . . . . . basaltic,rock and altered materials
Number of Satellites . . . . . . . . . . . . . . . . . . . . . . . 2
Interesting Facts about this Planet