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HOME  >  SCIENCE  >  ASTRONOMY

Earth vs Mars size comparison



Here is the comparison of the size between the Earth and Mars planets. So with the big blue and the little red.

Mars
Mars


Object Earth Mars
TypeRocky planetRocky planet
Age4.54 billion years4.6 billion years
Population7.7 billion0
Diameter12,742 km6,779 km
Mean radius6,371 km3,389 km
Mass5.97 × 1024 kg6.39 × 1023 kg
Orbital period365 days686 days
Rotation duration24 hours24 hours
Surface temperature
(average)
288 K
14.9 °C
58.7 °F
210 K
-63 °C
-82 °F
Surface gravity9.8 m/s²3.7 m/s²
Mean density5.5 g/cm33.9 g/cm3
Orbital distance150 million km230 million km
Circumference40,075 km21,344 km
Surface area510 million km²144 million km²
Volume1.08 × 1012 km31.63 × 1011 km3
Escape velocity11.1 km/s5 km/s
Average orbital speed29.78 km/s24 km/s
Aphelion152 million km249 million km
Perihelion147 million km206 million km
Semi major axis149 million km227 million km
Inclination7.1°1.8°
Satellites 1 natural satellite
5 quasi-satellites
1,800 artificial satellites
2 natural satellites
0 quasi-satellite
7 artificial satellites
Surface pressure101.3 kPa0.6 kPa
Atmosphere composition 78% nitrogen (N2),
21% oxygen (O2),
~ 1% water vapor,
0.9% argon,
0.04% carbon dioxide
96% carbon dioxide,
1.9% argon,
1.9% nitrogen,
0.15% oxygen,
0.05% carbon monoxide,
0.02% water vapor,
0.01% nitrogen oxide
Crust composition 60% silica,
16% alumina,
6% lime,
6% iron oxide,
4% magnesia,
3% sodium oxide,
2% potassium oxide
silica,
calcium sulfate,
iron,
magnetite
Distance from the Milky Way center27,200 light years27,200 light years


Note: if one of the objects is not visible, it just means that it is too tiny to be displayed compared to the other one.


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