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Equatorial Diameter: 6,791 km (4,220 miles) Mars Day: 24 hours, 37 minutes, 23 seconds Mars Year: 687 days Atmosphere: mostly carbon dioxide Surface Conditions: - temperature as low as -120 °C (-184 ° F) - occasional 100 km/h winds - continent-size dust storms Average Distance from Sun: 227.7 million km (141.5 million miles) Highest Point: Olympus Mons 15.85 km (52,000 feet) Lowest Point: Valleris Marineris 6.5 km (4 miles) deep (deeper than Grand Canyon) Deepest Crater: Hellas Planitia 9 km (6 miles) deep Axis Tilt: 25 degrees (giving Mars seasons similar to Earth's) Moons: Phobos: diameter 28 km (17.4 miles) Deimos: diameter 16.1 km (10 miles) |