Rocky · 4th planet from the Sun
Mars
The Red Planet — home to Olympus Mons, the largest known volcano in the solar system, and the primary target in the search for past microbial life.
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Size & Distance
Diameter6,779 km
Vs. Earth's diameter0.53×
Distance from Sun1.52 AU (227.9M km)
Distance from Earth (range)78M – 377M km
Mass & Gravity
Mass vs. Earth0.107×
Surface gravity vs. Earth0.378×
Known moons2 (Phobos, Deimos)
Time
Length of day24 hours 37 minutes
Length of year687 days (~1.9 years)
Orbit
Orbital period687 days
Planet typeRocky
Interesting facts about Mars
- Mars's red color comes from iron oxide (rust) covering its surface.
- Olympus Mons stands about 22 km tall — roughly 2.5 times the height of Mount Everest.
- A Mars day (called a 'sol') is only slightly longer than an Earth day, making Mars the most Earth-like in rotation.
FAQ
How far is Mars from the Sun?
An average of about 1.52 AU (227.9 million km).
How big is Mars?
6,779 km in diameter — about 0.53× the diameter of Earth.
How much would I weigh on Mars?
Multiply your Earth weight by 0.378 — Mars's surface gravity is 0.378× Earth's. Try our weight calculator for an exact number.
Other planets
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