Which planet is known as Earth's sister planet?

Venus is often referred to as Earth's sister planet due to several similarities in their physical characteristics. Both planets have a similar size, mass, and composition. They are both terrestrial planets, meaning they have solid, rocky surfaces, and they share similar geological features. Venus is only slightly smaller than Earth, and their densities are comparable, leading to the comparison as "sister" planets.

Moreover, both planets are located in the inner solar system and have similar orbital distances from the Sun, which further cements their relationship. However, despite these similarities, their atmospheres and climates are quite different, with Venus having a thick, toxic atmosphere rich in carbon dioxide and clouds of sulfuric acid, creating extreme greenhouse conditions.

Understanding these characteristics and their implications is important when studying planetary science and the dynamics of our solar system.