text: Despite this, the author does not do much to explain why studying Venus is worth the risk. In the fourth paragraph he claims that the reason why scientists are discussing further visits is because "Astronomers are fascinated by Venus because it may well once have been the most Earth-like planet in our solar system." The second piece of evidence he provides is that "Venus can sometimes be our nearest option for a planetary visit," alluding to the second paragraph, where he explained that Earth, Venus, and Mars all orbit the sun at different speeds, causing them to vary in the distances they are from each other. The facts that Venus is a little bit like Earth and that it is one of two planets that are near to Earth sometimes do not cause readers to feel like a trip to Venus is justified, because these do not seem like good enough reasons to brave the dangers. These are the only two justifications the author offers before labeling the value of returning to Venus as "indisputable." Compared to the huge amount of challenges in the paragraph before, readers do not feel the same way. The author then goes on to explain how NASA would send people to Venus, which does not support the claim at all.