ComparisonChart

Comparison of Earth with Mars

Characteristics	Earth	Mars
Diameter	12,756 km.	6,786 km.
Density	5.5	3.9
Axis Tilt	23.5°	25.2°
Length of Year	365 days	687 days Earth days
Hours Per Day	24 hrs.	24 hrs. 37 min. Earth time
Distance from Sun (in millions of miles)	147.1-152.1 km. about 93,000,000 miles	206.6-249.2 km. about 141,500,000 miles
Gravity	100%	38% of Earth's gravity
Soil	silicon and oxygen bound up with metallic elements such as iron and magnesium plus organic particles.	silicon and oxygen bound up with metallic elements such as iron and magnesium.
Atmosphere	78% nitrogen, 21% oxygen, 03% carbon dioxide, 1% argon, and small amounts of other gases.	95% carbon dioxide, 3% argon, 0.13% oxygen, 0.01% water vapor, xenon, neon, krypton, and very small amounts of ozone and hydrogen
Surface Pressure	1.00 relative to the other planets.	1/200th of Earth's
Northern Polar Cap	frozen water	ice and snow
Southern Polar Cap	ice and snow	frozen carbon dioxide
Temperature Range	-127° - 136° F	-194° -72° F
Surface Features	seas and land including mountains, craters, valleys, and volcanos	no seas but mountains, craters, valleys, and volcanos
Weather	four seasons, storms, including rain, hurricanes, snow and wind	four seasons and wind storms
Life Forms	plant and animal life	none, possible microorganisms
Ozone Layer	a layer of the Earth's atmosphere at heights of about 32 - 48 km. that is normally characterized by high ozone content which blocks most of the Sun's ultraviolet radiation from entry into the lower atmosphere.	none
In Mythology	Gaea, or Earth goddess of the ancient Greeks; and Terra mother Earth in Roman mythology	Mars, Roman god of war
Symbol	Greek for sphaira or sphere	his shield and spear
Number of Satellites	1 moon	2 moons
Name of Satellites	moon	Phobos and Deimos
Position	3rd planet from the sun, and between Venus and Mars	4th planet from the Sun, and between Earth and Jupiter
Speed in Orbit	30 km. per second	24 km. per second

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