What is the hottest planet in the Solar System?

Venus is the hottest planet in the Solar System, with surface temperatures reaching an average of 475°C (900°F). Its thick atmosphere, composed mostly of carbon dioxide, creates an extreme greenhouse effect that traps heat. Despite being second from the Sun, Venus is hotter than Mercury because of this dense atmosphere. The planet’s surface is covered with volcanoes and vast plains, making it an inhospitable environment. Venus’s high temperatures and atmospheric pressure have made space exploration there a significant challenge.