Pluto Stamp Aboard NASA's New Horizons Probe Sets Guinness World Record

When NASA's New Horizons spacecraft flew by the dwarf planet Pluto one year ago this month, the mission set a number of records. The probe was the first to encounter the small world at the edge of our classical solar system, sending back images that revealed Pluto's surface for the first time. But beyond its own mission of exploration, New Horizons also served as the delivery vehicle for a 1.5-inch by 1-inch (3.8 by 2.5 cm) relic that set a record of its own.