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| atmosphere south Deimos Sun permafrost |
colder Roman ice temperature asteroids |
moons day Earth-like craters fourth |
This red planet has a very thin atmosphere that consists of 95% carbon dioxide (CO2), 3% nitrogen, and 1.6% argon (there is no oxygen). The surface of Mars is dry, rocky, and mostly covered with iron-rich dust. There are low-lying plains in the northern hemisphere, but the southern hemisphere is dotted with impact craters. The ground is frozen; this permafrost extends for several kilometers. The north and south poles of Mars are covered by ice caps composed of frozen water and carbon dioxide. Mars is much colder than the Earth. Mars' surface temperature ranges from a high of 68° F(20° C) to a low of -220° F(-140° C).
Each day on Mars takes 1.03 Earth days (24.6 hours). A year on Mars takes 687 Earth days; it takes this long for Mars to orbit the Sun once.
Mars has 2 tiny moons, Phobos and Deimos. They were probably asteroids that were pulled into orbit around Mars.
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