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.

Object	Moon	Mercury
Type	Rocky satellite	Rocky planet
Age	4.53 billion years	4.5 billion years
Diameter	3,474 km	7,760 km
Mean radius	1,737 km	3,880 km
Mass	7.34 × 1022 kg	3.3 × 1023 kg
Orbital period	27 days	87 days
Surface temperature (average)	220 K -53 °C -63 °F	340 K 67 °C 152.6 °F
Surface gravity	1.6 m/s²	3.7 m/s²
Mean density	3.3 g/cm3	5.42 g/cm3
Orbital distance	384,402 km	57 million km
Circumference	10,921 km	24,378 km
Surface area	37 million km²	189 million km²
Volume	2.19 × 1010 km3	2.44 × 1011 km3
Escape velocity	2.3 km/s	4.25 km/s
Average orbital speed	1.02 km/s	47.36 km/s
Semi major axis	384 thousands km	57 million km
Inclination	5.1°	7°
Surface pressure	10−7 Pa	0.5 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 center	27,200 light years	27,200 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.