Venus size compared to Mars

The size of Venus compared to that of Mars. The first is larger with a more intense gravity, a richer atmosphere, infernal temperatures.

Object	Venus	Mars
Type	Rocky planet	Rocky planet
Age	4.5 billion years	4.6 billion years
Diameter	12,104 km	6,779 km
Mean radius	6,051 km	3,389 km
Mass	4.86 × 1024 kg	6.39 × 1023 kg
Orbital period	224 days	686 days
Rotation duration	-243 days	24 hours
Surface temperature (average)	735 K 462 °C 863 °F	210 K -63 °C -82 °F
Surface gravity	8.8 m/s²	3.7 m/s²
Mean density	5.2 g/cm3	3.9 g/cm3
Orbital distance	108 million km	230 million km
Circumference	38,019 km	21,344 km
Surface area	460 million km²	144 million km²
Volume	0.92 × 1012 km3	1.63 × 1011 km3
Escape velocity	10.3 km/s	5 km/s
Average orbital speed	35 km/s	24 km/s
Aphelion	108 million km	249 million km
Perihelion	107 million km	206 million km
Semi major axis	108 million km	227 million km
Inclination	3.3°	1.8°
Surface pressure	9.2 MPa	0.6 kPa
Atmosphere composition	96.5% carbon dioxide, 3.5% nitrogen, 0.01% sulfur 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	silica, iron, nickel	silica, calcium sulfate, iron, magnetite
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.