Postage stamps honoring Mercury astronaut Alan Shepard, America’s first man in space, and NASA’s MESSENGER probe, the first spacecraft to orbit Mercury, will be presented on May 4th at a public event taking place at the Aviation Heritage Park in Dayton, Ohio. The first stamp salutes NASA’s Project Mercury, America’s first manned spaceflight program, and … Continue reading "USPS Commemorates Spaceflight Past and Present"