Stamp made a flyby of Pluto

USPS
OUTER SPACE

postage stamp

A postage stamp was onboard NASA's New Horizons spacecraft that made a flyby of Pluto in July 2015. That’s the farthest distance traveled by a postage stamp — more than 3 billion miles, as noted by Guinness World Records.

* | Tags: Fun facts Innovation Stamps USPS Fact #332 | July 1, 2025

The “Pluto: Not Yet Explored” 29-cent stamp was part of a set of solar system stamps that were issued in 1991. In 2015, the stamp made a flyby of Pluto while onboard NASA’s New Horizons spacecraft. Guinness World Records confirmed the more than 3-billion-mile journey is the farthest distance traveled by a postage stamp.