Today in 2006: Pluto was reclassified as a "dwarf planet" when the International Astronomical Union passed a resolution redefining criteria for planetary status: http://s.si.edu/1PMwMgx
The New Horizons spacecraft flew by Pluto earlier this summer. Its instruments captured the four images and data used to make this global view.
If you’re planning a visit to our Museum in Washington, DC, don’t miss the blink comparator in our “Exploring the Planets” gallery that Clyde Tombaugh used to discover Pluto over 80 years ago: http://s.si.edu/1KHw5Rq
Image Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute