text: Venus is often refered as Earth's "twin" because Venus is the closest planet to earth in density and size. If its like earth in many ways why is it so dangerous? Venus is the hottest planet out there; although Mercury is the clostes to the sun venus is still the hottset plantet in our solar system. Venus temperatures average over 800 degress Fahrenheit. These condition are very extreme that no human could live there if they wanted too.