We. not learnt much about mars yet
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we know plenty about mars
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Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System, being larger than only Mercury. In English, Mars carries the name of the Roman god of war and is often referred to as the "Red Planet". Wikipedia
Gravity: 3.721 m/s²
Surface area: 144.8 million km²
Length of day: 1d 0h 37m
Surface pressure: 0.636 (0.4–0.87) kPa; 0.00628 atm
Equatorial rotation velocity: 241.17 m/s; (868.22 km/h; 539.49 mph)
Moons: Phobos, Deimos
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