The problem with Venus is that the atmospheric pressure at surface level is about 92 times that of earth, the surface temperature is 735 K, and the atmosphere c

The problem with Venus is that the atmospheric pressure at surface level is about 92 times that of earth, the surface temperature is 735 K, and the atmosphere contains 96.5% carbon dioxide, while also containing significant amounts of sulfur dioxide. This is even more toxic than the Martian atmosphere. If you want to terraform Venus to a (human livable) state you'd probably need to give it a solar shade to cool the planet to decent temperatures, shrub the 4.6 10^17 tonnes of carbon dioxide out of the atmosphere and remove those 7.210^13 tonnes of sulfur dioxide. edit Also, please note that Venus has a 117 earth day solar day, while the Martian solar day is only 24h 37m. Sources: wikipedia, google, calculator