The Pluto Discovery Plates
Filed under pretty pictures, history, trans-neptunian objects, Pluto, dwarf planets beyond Neptune
The photographic plates, taken 6 days apart with the 13 inch telescope, with which Clyde Tombaugh discovered Pluto. The arrows point to the position of Pluto on each of the two days.
Lowell Observatory Archives
Original image data dated on or about January 29, 1930