Venus is often referred to as "Earth's twin" due to its similar size, composition, and proximity to Earth. Both planets are classified as terrestrial planets and share a comparable diameter and mass. However, Venus has a thick, toxic atmosphere composed mainly of carbon dioxide, with clouds of sulfuric acid, resulting in extreme greenhouse effects and surface temperatures hot enough to melt lead. Despite these harsh conditions, the similarities in physical characteristics continue to intrigue scientists who study planetary formation and evolution. Understanding Venus can provide insights into Earth's own climate and geological history.