1957 a physicist studies alpha rays in a continuous cloud chamber.
Here, alpha particles from a polonium source emit in a flower-like pattern at the cloud chamber's center. The particles are made visible by means of alcohol vapor diffusing from an area at room temperature to an area at minus -78 degrees Centigrade. Image Credit: NASA
TIROS - designed by the Radio Corporation of America, the satellite was the country's first weather satellite. Pictured at NASA undergoing vibration testing.