Pluto before Pluto

With the New Horizons historic flyby of Pluto next week, imagine how excited we were a few weeks ago to unearth a set of plates from 1925 in our vault that include Pluto--five years before Pluto was discovered. This unexpected find led to a bit of historical detective work to uncover the story of these unusual astronomical plates. This?short video tells the tale of our digging and what we learned from it, and highlights the amazing work done by astronomers of an earlier, pre-digital era. You never know what you might find in your own archives!