Issued by Bulgaria on August 26, 1963, this complete set of four cancelled airmail stamps commemorates the space flights of Lt. Col. Valeri F. Bykovski (June 14-19, 1963) and Valentina Tereshkova (June 16-19, 1963). Tereshkova was the first woman cosmonaut. The 2011 Scott Catalogue value for this set is $1.35.

Issued by Albania on June 27, 2004, this mint set of four stamps featuring different phases of the moon: a full moon, a new moon, a half moon, and a waning moon. The 2011 Scott Catalogue value for this set is $5.30.

The former U.S. Trust Territory of Palau issued this mint sheet of 20 stamps on July 20, 1994, to commemorate the 25th anniversary of the first manned Moon landing. The stamps feature various scenes from Apollo moon missions. Text in the sheet selvage (bottom) describes the images on the stamps.

Issued by the Marshall Islands on October 1, 2008, this mint sheet of ten stamps features the following: Mercurey/Mariner 10, Uranus/Voyager 2, Venus/Mariner 2, Pluto/Voyager 2, Jupiter/Pioneer 11, Earth/Landsat, Moon/Lunar Orbiter, Saturn/Voyager 2, Mars/Viking Orbiter, and Neptune/Voyager 2.

Issued by East Germany (German Democratic Republic) on July 18, 1963, this mint set of two stamps (attached pair) commemorates the space flights of Valeri Bykovski (Vostok 6) and Valentina Tereshkova (Vostok 5). Tereshkova was the first woman cosmonaut (June 16-19, 1963).

This mint stamp, issued by East Germany (German Democratic Republic) on September 21, 1959, commemorates the landing of the Soviet rocket Lunik 2 on the moon (September 13, 1959). $0.60 retail value.

Issued by Ghana on August 16, 1967, this complete mint set of three stamps commemorates achievements in space. The stamps feature Orbiter 1 landing on the moon, Luna 10 on the moon, and an astronaut walking in space.

This cancelled set of four stamps, plus a 5th stamp in a souvenir sheet, was issued by Central African Republic on June 10, 1981. The set features the Apollo 15 space craft and vehicle and various space shuttle scenes (Columbia, Enterprise). An attractive set of stamps at a nice price; $3.90 retail value.

Featuring the Soyuz space ship, Apollo space ship, and astronauts and cosmonauts in cabin, this cancelled set of three airmail stamps was issued by Central African Republic on June 14, 1976. This cancelled set has a retail value of $1.75.

This set of six mint stamp sheets, including four sheets with nine stamps each and two souvenir sheets with one high face value stamp each, were issued in 1990 by Sierra Leone to commemorate the coming exploration of Mars. Brief descriptions of the stamp subjects are included on the stamps. Extreme speculation has occured with this set of sheets, centered around the Face on Mars stamp, which brought the asking price of the set to as high as $10,000 (please click on "Details" or the image for addtional information and to view all six stamp sheets). In reality, the retail value as based on asking prices from reputible stamp dealers, is $112 (Scott 2007 Standard Postage Stamp Catalogue, Vol. 5).