Pioneer 10

Pada 18 November 1999, US Postal Service menerbitkan perangko untuk memperingati misi Pioneer 10, sebagai satu dari 15 ikon selama era 1970-an, dengan inskripsi berbunyi: "Launched March 1972, Pioneer 10 was the first spacecraft to travel to an outer planet, providing data and images of Jupiter. Eleven years later, it became the first man-made object to leave the solar system."