对给定的英文段落进行概括，不超过50个单词，并将概括输出。
Venus is the second planet from the Sun and is the sixth largest in the solar system. Named after the Roman goddess of love and beauty, it is the brightest object in the night sky after the Moon. Venus is a terrestrial planet and is sometimes called Earth's "sister planet" because of their similar size, mass, and proximity to the Sun. It has thick clouds of sulfuric acid that make it difficult to observe its surface.
Venus is a terrestrial planet with thick sulfuric acid clouds, similar in size and proximity to the Sun as Earth, and is the brightest object in the night sky besides the Moon.