For the first time since 1991, Pluto and the solar system’s eight bigger planets are getting their own postage stamps – thanks to a U.S. Postal Service cosmopalooza that also spotlights Earth’s moon and “Star Trek.”
The Pluto stamp pays tribute to NASA’s New Horizons mission, and updates 1991’s speculative view of the dwarf planet. Back then, the legend on the 29-cent stamp read “Pluto – Not Yet Explored.” This time, the four-stamp sheet carries the label “Pluto – Explored!”
Mastermind of Cosmic Log, contributor to GeekWire and Universe Today, author of "The Case for Pluto: How a Little Planet Made a Big Difference," past president of the Council for the Advancement of Science Writing.