Mars

Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System after Mercury. 

Gravity: 3.711 m/s²

Radius: 3,390 km

Orbital period: 687 days

Surface area: 144.8 million km²

Surface pressure: 0.636 (0.4–0.87) kPa; 0.00628 atm

Moons: Phobos, Deimos

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NATIONAL GEOGRAPHIC