US 2016 Pluto Explored! Forever Stamps
United States pair of First-Class Forever stamps (Scott 5077-78) issued May 31, 2016, in New York City at World Stamp Show-NY 2016. One stamp shows Pluto as seen by NASA's New Horizons spacecraft and the other shows the spacecraft itself, answering the 1991 stamp that called Pluto "Not Yet Explored".
Text from OyList

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