xkcd takes on the question, “What is the furthest one human being has ever been from every other living person? Were they lonely?” in “Loneliest Human,” the latest edition of what if? According to xkcd, the likeliest candidates are NASA’s lunar command module pilots, who were about 2,227 miles from the nearest humans (fellow astronauts on the lunar surface) during the Apollo program moon landings. And according to reports by two command module pilots, no, they were not lonely. what if? is a weekly feature in which xkcd answers reader-submitted science questions.