text: In the past they have tried to explore it they have sent numerous spacecraft to land Venus. Each of the missions have been unmanned. Since no spacecraft have even survied the land more that a few hours. This explains why exploring Venus could be a good reason or a bad reason. The passage states that they have been succesful in three decades. It is a very challenging plant for humans to study. The atmosphere makes it even worse to travel through it being 97 persent carbon dioxide. The preasure from it is 90 percent worse even on top of that it can reach up to 800 degrees fahrenheit.