text: "Venus has the hottest surface temperature of any planet in our solar system, even though Mercury is closer to our sun," this one of many reasons why its so hard to study Venus. But it is also something that makes it unique. since Venus has a thick atmsphere of 97% carbon dioxide and clouds of highly corrosive sulfuric acid it is hard to land spacecrafts on it. Venus's unique atmsphere is what makes it challenging to discover more about Venus.