When NASA launched New Horizons back in 2006, the spacecraft payload included your traditional of “scientific instruments” and “maneuvering thrusters”. But the engineers included a collection of nine secret items as well, including ashes from Pluto discoverer Clyde Tombaugh, and few other trinkets.
To celebrate this exploration, the US Postal Service has announced a new series of Pluto stamps, with updated pictures of the dwarf planet and an artist’s illustration of New Horizons.
There were a bunch of space stamps released this week, including ones celebrating Star Trek, new views of the planets, and global stamps for the Moon (send a letter anywhere on Earth, but not to the Moon, strangely). Gotta collect them all!