Alan remembers how, in the late 1980s, “Somebody much more senior told me, ‘You will never sell going to Pluto to NASA as exploration. You have to find a way to bring the scientific community to declare it is an important priority for the specific science that such a mission will yield.’” DISCOVERING PLUTO—1930 Of all the classically known planets, Pluto was not just the farthest and the last to be explored, it was also the most recently discovered—within the lifetime of many people who are still alive. Its discovery in 1930 by Clyde Tombaugh, a Kansas farm boy with no formal technical