Index / Space Objects / Mars
Space Objects
Mars
Fourth planet · the Red Planet
Olympus Mons is the tallest volcano in the solar system — 22 km high, the size of France. Valles Marineris cuts across a fifth of the planet. Ancient riverbeds and polar ice tell the story of a wetter Mars.
Key specifications
Diameter
6,779 km (53% ⊕)
Day (sol)
24 h 37 m
Surface T (avg)
−63 °C
Atmosphere
96% CO₂, ~0.6% of ⊕
Sheet 006 · Plate 1 of 1 · 1:1 infographic
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