The Blue Marble (as the design is called) is an image of Earth taken on December 7, 1972, from a distance of 29,000 kilometers(18,000 miles) from the planet's surface. It was taken by the crew of the Apollo 17 spacecraft on its way to the Moon and is one of the most reproduced images in history. (description by Wikepedia)

The pin is 1" diameter, design is digitally printed on stainless steel and has a smooth epoxy coating. Each pin has a butterfly clasp on the reverse side.