Pictured above is a one and one-half inch silicon disc left on the moon by the Apollo 11 astronauts, just a few feet away from the first boot print.

The disc bears 73 messages of goodwill from heads of state of many nations. The letters are so tiny that they're one-fourth the width of a human hair. The process used to make this wafer is the same as that used to manufacture integrated circuits for electronic equipment.

The Kennedy half-dollar illustrates the relative size of the memorial disc.

:: We Came In Peace For All Mankind