Earth's sister planet (?) - the size, mass and density are approx. the
same, surface gravity .9 Earth normal
IAU only female names
It is the closest planet to Earth
.7 AU from the Sun
Atmosphere
Composition
96% CO2
<4% N2
<1% O2
<.1% H2O
This produces a runaway Greenhouse Effect
Surface temp - 750 K (900oF)
Atmospheric Pressure - 90 x greater
Sulfuric acid Rain
A lot of lightning
Revolution
105 Earth days
Rotation
127 Earth days - the day is longer than the yr
retrograde - sun rises in the west
Impact during formation (?) - ad hoc
Topography
Radar mapped
Flat - 60% rolling plains
16% below this vs. 66% on Earth
Only two large continents ( Ishtar and Aphrodite )
Geology
No plate tectonics
Signs of Vulcanism
Soil material seems to be mostly basaltic