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HOME  >  SCIENCE  >  ASTRONOMY

Size comparison: Moon vs Mercury



Comparison of the size between our satellite, the Moon and the planet closest to the Sun: Mercury.

Mercury is twice as large as the Moon. Its weight is 4 times greater. Its gravity is twice as high.

Mercury
Mercury


Object Moon Mercury
TypeRocky satelliteRocky planet
Age4.53 billion years4.5 billion years
Diameter3,474 km7,760 km
Mean radius1,737 km3,880 km
Mass7.34 × 1022 kg3.3 × 1023 kg
Orbital period27 days87 days
Surface temperature
(average)
220 K
-53 °C
-63 °F
340 K
67 °C
152.6 °F
Surface gravity1.6 m/s²3.7 m/s²
Mean density3.3 g/cm35.42 g/cm3
Orbital distance384,402 km57 million km
Circumference10,921 km24,378 km
Surface area37 million km²189 million km²
Volume2.19 × 1010 km32.44 × 1011 km3
Escape velocity2.3 km/s4.25 km/s
Average orbital speed1.02 km/s47.36 km/s
Semi major axis384 thousands km57 million km
Inclination5.1°7°
Surface pressure10−7 Pa0.5 nPa
Atmosphere composition argon,
helium,
neon
atomic hydrogen,
helium,
atomic oxygen
Crust composition 45% silica,
19% alumina,
14% lime,
10% iron,
2% titanium dioxide,
0.6% sodium oxide
silicate,
iron sulfide
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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