![]() "Since the early 1990s the old, ‘Pluto Not Explored’ stamp served as a rallying cry for many who wanted to mount this historic mission of space exploration. The team petitioned to have a stamp celebrating the achievement and the USPS agreed. The mission's team proudly declared Pluto was now explored after the flyby. New Horizons carried that stamp to Pluto as part of its payload. The USPS stamp for Pluto was a greenish-organ circle with the words " Not Yet Explored" printed next to its name. At that time, Pluto was still a planet, but unexplored. Pluto famously was featured in a set of stamps celebrating NASA's exploration of the solar system in 1991. The data collected by New Horizons will continue to refine our understanding of Pluto and planetary evolution for the next decade. New Horizons also captured incredible photos of Charon and Pluto's smaller moons Hydra, Nix and Kerberos. There are also ice mountains on its surface. Most famously, Pluto has a heart-shaped plain. The spacecraft did not slow down or spend much time around Pluto, but the flyby delivered unprecedented views of the dwarf planet. ![]() New Horizons completed its close flyby of Pluto on July 14. Last, but certainly not least, Earth's moon gets its own special edition stamp in 2016. The views of the eight planets - and dwarf planet - that make up the solar system receive their own stamps in 2016. The exploration of Pluto by the New Horizons spacecraft was a historic event that completes NASA's exploration of the inner solar system. Postal Service (USPS) will commemorate the dwarf planet with a new stamp. Pluto's great year will continue into 2016, when the U.S. Postal Service will honor the New Horizons mission with a "Pluto Explored" stamp in 2016.
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