By Norman Bryden
Mars Statistics

Atmospheric composition: 95.32% carbon dioxide, 2.7% nitrogen, 1.6% argon, 0.13% oxygen, 0.07% carbon monoxide, 0.03% water vapor, trace neon, krypton, xenon, ozone, methane

Atmospheric surface pressure: 1-9 millibars depending on altitude, with an average pressure of 7 millibars

Circumference at the equator: approximately 21343 kilometers (13300 miles) compared to Earth 40074 kilometers (24900 miles)

Diameter: 6780 kilometers (4213 miles) compared to Earth 12756.1 kilometers (7926.28 miles) at the equator

Distance from Sun average: 227,920,000 kilometers (141,620,000 miles)

Distance from Sun range: 206,620,000 kilometers (128,390,000 miles) to about 249,230,000 kilometers (154,860,000 miles)

Gravity force: 38% of Earth

Moons: Phobos, Deimos

Orbit: 687 Earth days for one revolution around the Sun and for one Martian year

Solar day: 24 hours 39 minutes 35 seconds

Temperature range of the Martian surface: around -125 degrees Celsius (-195 degrees Fahrenheit) near the poles during the peak of winter to around 20 degrees Celsius (70 degrees Fahrenheit) near the equator

Data credit: NASA and other sources