|Equatorial Mean Radius (x1011 m)||2.28||1.50|
|Sun Distance (UA)||1.38-1.67||0.98-1.02|
|LS at perihelion||251º||281º|
|Passage||687 Earth's days-667 Mars' days||365.256 Earth's days|
|Satellites||Phobos and Deimos||Moon|
PLANETARY FEATURES COMPARISON
Mars has a very small mass (about 10% of the Earth's mass) and a radius perceptibly smaller. Thus, Mars' surface gravity is 1/3 of the terrestrial.
|Equatorial Radius (106m)||3.396||6.378|
|Density (g cm-3)||3.9||5.5|
|Surface Gravity (m/s2)||3.72||9.81|
ATMOSPHERES COMPARISON. CHEMICAL COMPOSITION
- Martian atmosphere is mainly compound of carbon dioxide, being water vapor ratio perceptibly smaller than terrestrial.
- Molecular Oxygen proportion is also very small, thus atmosphere's Ozone is smaller than terrestrial too.
- Next table shows atmospherical main gases proportion in each planet.
THERMODINAMICAL PARAMETERS COMPARISON
- Martian atmosphere is very light (100 times lighter than terrestrial).
- The pressure on the surface of Mars depends on the seasons. During Martian winter, the 30% of the Martian atmosphere condense at polar icecaps.
- The temperature has a higher range of variation. This is caused by the lack of a thermodynamic regulator as terrestrial oceans are.
- Dust storms are common and they can be active during months.
Gas constant R(m2s-2K-1)
Specific heat capacity at constant pressure(m2s-2K-1)
Pressure on the surface (hPa)
Temperature on the surface (K)
Mean density (kg/m3)