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Mars Facts and Figures

Data and information on Mars.
Grades:
6 |
7 |
8
Subjects:
Science (4,780)


Planets (147)

Themes:
Space (472)

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Because of its blood-red color (which comes from iron-rich dust), this planet was named for Mars, the Roman god of war. Mars is the fourth planet from the Sun, situated between Earth and Jupiter. Three-quarters red, Mars also has dark blotches on it andwhite areas at the poles—these are white polar ice caps.

  • Size: About one-quarter the size of Earth
  • Diameter: 4,194 miles (6,794 km)
  • Surface: Canyons, dunes, volcanoes, and polar caps of water ice and carbon dioxide ice
  • Atmosphere: carbon dioxide (95%)
  • Temperature: as low as –305°F (–187°C)
  • Rotation of its axis: 24 Earth hours, 37 minutes, 23 seconds
  • Rotation around the Sun: 687 Earth days
  • Your weight: If you weigh 100 pounds on Earth, you would weigh 38 pounds on Mars.
  • Distance from Earth: 35 million miles (56 million km) at the closest point in its orbit
  • Mean Distance from Sun:141.71 million miles (227.9 million km)
  • Satellites: 2
  • Rings: 0
  • Return to Planet Index

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