text: Comparison systems that use mechanical parts can be made more resistant to pressure, heat, and other forces. Exploring venus is dangorus because if NASA is planning someone too venus wouldn't be a good idea is better sending them in a group but sending someone alone is not a good idea. Venus is the closest planet to Earth terms of density and size and occasionally the closet in distance too. Earth, Venus, and Mars and the other planetary neighbor orbit the sun at different speeds. The differences in speed mean that sometimes we are closer to mars and other times to venus.