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Link:
very detailed list of planetary facts
Comparison Mars Earth
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Mars |
Earth |
Ratio
Mars :
Earth |
| equatorial radius in km |
3393,4 |
6378,1 |
0,532 : 1 |
| gravitation in m/s2 |
3,719 |
9,81 |
0,379 : 1 |
| mass in 1024kg |
0,64185 |
5,974 |
0,107 : 1 |
| duration of a sideral day in h |
24,6229 |
23,9345 |
1,029 : 1 |
duration of a year
in sideral Earth days |
686,980 |
365,256 |
1,88 : 1 |
Comparison of the atmospheres
(composition in volume percent)
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Mars |
Earth |
Ratio
Mars :
Earth |
| surface pressure: |
6,7 mbar |
1013 mbar |
0,0066 : 1 |
| Carbon dioxide CO2 |
95,32 % |
0,035 % |
2723 : 1 |
| Nitrogen N2 |
2,7 % |
78 % |
0,035 : 1 |
| Argon Ar |
1,6 % |
0,93 % |
1,72 : 1 |
| Oxygen O2 |
0,13 % |
20,95 % |
0,0062 : 1 |
| Carbon monoxide CO |
0,07 % |
0,1 ppm |
7000 : 1 |
| Water H2O |
0,03 % |
0 bis 4 % |
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Overview of the Martian moons
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Deimos |
Phobos |
| dimensions in km |
15x12x11 |
27x21x19 |
| semi major axis in km |
23490 |
9350 |
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Deimos is one of the smallest known moons in our solar system. It's orbiting in the third smallest
radius. Phobos is also a quite tiny moon having the smallest major
axis (of all moons) in the solar system. Due to gravitational effects between Mars and
Phobos, it is continuously braked and loosing
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altitude by 1.8 meters per century. Both moons are characterised by a low
albedo, this means that a small amount of the sun exposure is
reflected, thus the body is very dark. The structure of the
moons gives hints, that they are captured asteroids.
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