15 ABR. 2003
Data de publicação
187925
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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 |
Axial tilt (obliquity) | 178° | 23.5° |
Surface gravity (equator) | 8.9 m/s2 | 9.8 m/s2 |
Moons | None | 1 (The Moon) |
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