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Home Pluto Explored! In 2006, NASA placed a 29-cent 1991 ‘Pluto: Not Yet Explored’ stamp in the New Horizons spacecraft. In 2015 the spacecraft carried the stamp on its history-making mission to Pluto and beyond. With this stamp, the Postal Service recognizes the first reconnaissance of Pluto in 2015 by NASA’s New Horizon mission. The souvenir sheet of four stamps contains two new stamps appearing twice. The first stamp shows an artists’ rendering of the New Horizons spacecraft and the second shows the spacecraft’s enhanced color image of Pluto taken near closest approach. (USPS/Antonio Alcalá © 2016 USPS) Pluto Explored! In 2006, NASA placed a 29-cent 1991 ‘Pluto: Not Yet Explored’ stamp in the New Horizons spacecraft. In 2015 the spacecraft carried the stamp on its history-making mission to Pluto and beyond. With this stamp, the Postal Service recognizes the first reconnaissance of Pluto in 2015 by NASA’s New Horizon mission. The souvenir sheet of four stamps contains two new stamps appearing twice. The first stamp shows an artists’ rendering of the New Horizons spacecraft and the second shows the spacecraft’s enhanced color image of Pluto taken near closest approach. (USPS/Antonio Alcalá © 2016 USPS)

Pluto Explored! In 2006, NASA placed a 29-cent 1991 ‘Pluto: Not Yet Explored’ stamp in the New Horizons spacecraft. In 2015 the spacecraft carried the stamp on its history-making mission to Pluto and beyond. With this stamp, the Postal Service recognizes the first reconnaissance of Pluto in 2015 by NASA’s New Horizon mission. The souvenir sheet of four stamps contains two new stamps appearing twice. The first stamp shows an artists’ rendering of the New Horizons spacecraft and the second shows the spacecraft’s enhanced color image of Pluto taken near closest approach. (USPS/Antonio Alcalá © 2016 USPS)

Pluto Explored! In 2006, NASA placed a 29-cent 1991 ‘Pluto: Not Yet Explored’ stamp in the New Horizons spacecraft. In 2015 the spacecraft carried the stamp on its history-making mission to Pluto and beyond. With this stamp, the Postal Service recognizes the first reconnaissance of Pluto in 2015 by NASA’s New Horizon mission. The souvenir sheet of four stamps contains two new stamps appearing twice. The first stamp shows an artists’ rendering of the New Horizons spacecraft and the second shows the spacecraft’s enhanced color image of Pluto taken near closest approach. (USPS/Antonio Alcalá © 2016 USPS)

Pluto Explored! In 2006, NASA placed a 29-cent 1991 ‘Pluto: Not Yet Explored’ stamp in the New Horizons spacecraft. In 2015 the spacecraft carried the stamp on its history-making mission to Pluto and beyond. With this stamp, the Postal Service recognizes the first reconnaissance of Pluto in 2015 by NASA’s New Horizon mission. The souvenir sheet of four stamps contains two new stamps appearing twice. The first stamp shows an artists’ rendering of the New Horizons spacecraft and the second shows the spacecraft’s enhanced color image of Pluto taken near closest approach. (USPS/Antonio Alcalá © 2016 USPS)

Pluto Explored. (left to right): New Horizons Principal Investigator Alan Stern of Southwest Research Institute (SwRI), Boulder, Colorado; New Horizons’ Deputy Project Scientist Leslie Young, SwRI; Johns Hopkins University Applied Physics Laboratory (APL) Director Ralph Semmel; Annette Tombaugh, daughter of Clyde Tombaugh, who discovered Pluto in 1930; and New Horizons Co-Investigator Will Grundy, Lowell Observatory, Flagstaff, Arizona hold a print of the 1991 Pluto stamp –with their suggested update – on July 14 at APL in Laurel, Maryland. (NASA/Bill Ingalls)