text: The author states that Venus is "often referred to as Earth's 'twin'" because out of all the planets Venus has a similar density and size compared to Earth. The terrain of Venus is also very similar to the terrain of Earth. They both have landmarks that are similar "to familiar features such as valleys, mountains, and craters." This evidence shows how the landscape of Venus has the possibility to be a home for humans. The similarities between Earth and Venus make Venus a valuable place to explore in greater depth.