Planet Guide and Information - Venus

Distance from Sun (average)
108 million km
12,104 km
Length of day
114 days
Length of year
225 days
Mean surface temperature

Venus is probably the most inhospitable planet in the entire solar system, due to its runaway greenhouse effect resulting in an atmosphere made up of around 96% carbon dioxide. The clouds which cover the entire surface are comprised of mostly sulphuric acid, giving rise to real 'acid rain'. The air pressure on the planet's surface is nearly 100 times greater than that on Earth making human trips to this planet highly unlikely.