Offered for sale is a stunning 48 stamp sheet, issued by the United States in 1981, depicting space achievements: Exploring the Moon, featuring an astronaut on the moon; Benefiting Mankind, four center stamps featuring the Columbia space shuttle; Understanding the Sun, featuring the Skylab space station; Probing The Planets, featuring Pioneer 11 near the Saturn; and Comprehending the Universe, featuring a space telescope. The sheet is Scott catalog #1912-9.