Ambassadors from Earth: Pioneering Explorations with Unmanned Spacecraft

Rewind to the 1950s and ponder: was America’s first satellite really built by a college student? How did a small band of underappreciated Russian engineers get pictures of the moon’s far side—using stolen American film? As the 1960s progressed, consider: how the heck did people learn to steer a spacecraft using nothing but gravity? And just how were humans able to goose a spaceship through a thirty-year journey to the literal edge of our solar system?
 
Ambassadors from Earth re…