The Arecibo radio telescope in Puerto Rico transmitted the most powerful known interstellar message in 1974. The facility's ...

The Arecibo Observatory may be no longer, but its thoughtful message continues to inspire astronomers and scholars worldwide.

John J. Salka Jr. makes sure that battalion chiefs and other incident commanders don't overlook the importance of their ...

Sending electromagnetic waves into the air. In 1894, Marconi transmitted the first radio waves. The first commercial radio station to transmit audio frequencies was KDKA in Pittsburgh ...

To the shipboard radio operators ... It had only been eleven years since Guglielmo Marconi sent the first "wireless" transmission with his new invention, and only five since Marconi sent signals ...

carried out humanity's first modern attempt to detect interstellar radio transmissions. Project Ozma was named after the queen of L. Frank Baum's imaginary land of Oz -- a place "very far away, ...