Mars is the fourth planet from the Sun.

Named after the Roman god of war, and often described as the "Red Planet" due to its reddish appearance. Mars is a terrestrial planet with a thin atmosphere composed primarily of carbon dioxide.

Earth has a dynamic atmosphere, which sustains Earth's surface conditions and protects it from most meteoroids and UV-light at entry. It has a composition of primarily nitrogen and oxygen. Water vapor is widely present in the atmosphere, forming clouds that cover most of the planet.

Mars Facts

  • Equatorial Diameter: 6,792 km
  • Polar Diameter: 6,752 km
  • Mass: 6.39 x 10^23 kg (0.11 Earths)
  • Moons: 2 (Phobos & Deimos)
  • Orbit Distance: 227,943,824 km (1.38 AU)
  • Orbit Period: 687 days (1.9 years)
  • Surface Temperature: -87° to -5°C
  • First Record: 2nd millennium BC
  • Recorded By: Egyptian astronomers