Venus is the second planet from the Sun and has the hottest surface temperature in the solar system at 500 degrees Celsius due to its dense carbon dioxide atmosphere that traps heat. While Venus is similar in size to Earth, it cannot sustain life due to extreme temperatures, atmospheric pressure, and lack of water on its primarily rocky surface dominated by volcanoes larger than Mount Everest. Venus's day lasts over eight months and its dense atmosphere is made up mostly of carbon dioxide and other deadly gases that could crush humans.