Venus is often called Earth's twin due to its similar size, mass, and proximity to our planet. However, despite these similarities, Venus has a very different atmosphere and surface conditions. It has a thick atmosphere primarily composed of carbon dioxide, leading to a greenhouse effect that results in extremely high temperatures, making it the hottest planet in our solar system. Its surface is rocky and marked by volcanoes, while the atmosphere contains sulfuric acid clouds. This striking contrast highlights the diverse environments that exist within our solar system, demonstrating how slight variations can lead to vastly different planetary conditions.