text: Venus's thick atmosphere is made up of almost 97 percent carbon dioxide, which blankets the whole planet. The average temperature is about 800 degrees Fahrenheit, and the atmospheric pressure is 90 times greater that what we experience. Scientists should know that if they try and send a spacecraft full of men to Venus and land they are risking lives. Scientists want to study the planet on how it used to be, they belive it used to be just like Earth and it could've supported living things.