text: Venus is oftened referred to as Earth's "twin". Earth and Venus orbit different speeds. These differences in speed mean that sometimes we are closer to Mars and other times to Venus because Venus is sometimes right around the corner-in space terms-humans have sent numerous spacecraft to land on this cloud draped world. Each previous missions was unmanned, and for good reason, since no spacecraft survived the landing for more than a few hours. This issue explains why not a single spaceship had landed on Venus and numerous factors contribute to Venus's reputation as a challenging planet for humans to study.