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| | | | | | | Venus compared to Earth
A comparison of terrestrial planets
Venus, Mars and Earth, three out of the four inner or ‘rocky’ planets of the Solar System, have a lot in common – a solid surface you could walk on, a comparable surface composition, an atmosphere and a weather system.
If you are looking for a twin sister to Earth, that would be Venus... or is it?
| | Venus | Earth | | Mass | 4.87 x 1024 kg | 5.98 x 1024 kg | | Radius | 6052 km | 6378 km | | Density | 5250 kg/m3 | 5520 kg/m3 | | Av. distance from Sun | 108 million km | 150 million km | | Rotation period (day) | 243 Earth days (retrograde) | 23 hours 56 minutes | | Orbit period (year) | 224.7 Earth days | 365.2 days | | Surface temp. (mean) | 465 °C | 15 °C | | Surface pressure | 90 bar | 1 bar (sea level) | | Albedo (reflectivity) | 0.76 | 0.37 | | Highest point on surface | Maxwell Montes
(17 km) | Mount Everest
(8.8 km) | | Atmosphere | 96% CO2 , 3% N2 | 78% N2 , 21% O2, 1% Ar | | Surface composition | Basalt rock, altered materials | Basalt, granite, altered materials | | Orbit inclination | 3.4° | 0° by definition | | Obliquity of axis | 178° | 23.5° | | Surface gravity (equator) | 8.9 m/s2 | 9.8 m/s2 | | Moons | None | 1 (The Moon) | | | | |
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