On the right is a tiny toilet, revved with extra power for a low-gravity flush. On the left, computer stations quickly convert into a conference table for strategy meetings. Near the front, a sealed “glove box” allows people to handle hot rocks. On the ceiling, two beds hang, ready to be pulled down when night comes. Welcome to an RV in space, otherwise known as a Mars rover, the workings of University of Michigan engineering students preparing for man’s first travel on the fourth rock from the Sun.