Venus is a terrestrial planet.
A terrestrial planet , telluric planet , or rocky planet is a planet that is composed primarily of silicate rocks or metals . Within the Solar System , the terrestrial planets are the inner planets closest to the Sun , i.e. Mercury , Venus , Earth , and Mars . Venus . Venus is a terrestrial planet and is sometimes called Earth 's `` sister planet '' because of their similar size , mass , proximity to the Sun , and bulk composition . It has the densest atmosphere of the four terrestrial planets , consisting of more than 96 % carbon dioxide .