The Postal Service issued an Exploring the Solar System souvenir sheet featuring five 1-dollar commemorative stamps in Anaheim, California, on July 11, 2000. These stamps, designed by Richard Sheaff of Scottsdale, Arizona, are based on different images of the Earth's sun, as described below.
These five stamps represent the exploration of our solar system and are the first pentagonal stamps ever issued by the U.S. Postal Service. They depict (clockwise from the top) an image of a solar eclipse from a satellite by Dan McCoy; an illustrated cutaway view of the sun by artist Jim Lamb; a digitally restored NASA image of sunrise from space, courtesy of Stock Solution; an image made by Skylab on December 19, 1973, of a solar eruption, courtesy of Solar Physics Group/Naval Research Laboratory; and a photograph from Earth of the sun in a partly cloudy sky by Craig Aurness, courtesy of Corbiss. The selvage is a montage of Saturn and several of its moons imaged by Voyager I in November 1980, courtesy of NASA.
Postal Bulletin (June 1, 2000)