Project Echo - Wikipedia
Michael Moloney on X: "Project Echo was the first passive communications satellite experiment, launched in 1960. Now there's over 2,000 communications satellites orbiting Earth! Find out more with @AIPHistory – this diagram
Echo | Communication, Imaging & Navigation | Britannica
Project Echo 1
Spacewatch: Nasa's Echo 1 anniversary | Science | The Guardian
Beginning the Age of Satellite Communication: Echo 1, August 1960 | Roger Launius's Blog
With an Echo, satellite communications take off (photos) - CNET
U.S. Space Command - It's been almost 75 years since humans first bounced a signal off an orbital object and received it back on Earth. In that case, we used the Moon
Early communications satellite Echo 1 - Stock Image - S710/0188 - Science Photo Library
The Echo 1 Satellite by Bettmann
Project Echo - Wikipedia
The Balloon Satellites of Project Echo | Amusing Planet
The Balloon Satellites of Project Echo | Amusing Planet
Echo | Communication, Imaging & Navigation | Britannica
With an Echo, satellite communications take off (photos) - CNET
NASA - NSSDCA - Spacecraft - Details
Echo Launch Adapter
Echo 1 Satellite during tests in 1960: 30.5 m in diameter, 0.5 mil Mylar. | Download Scientific Diagram
First Pass of Echo 1 Satellite Over the Goldstone Tracking Station - NASA
Echo-1 Communications Satellite - Decades TV Network
Project Echo - Wikipedia
Project Echo - Wikipedia
Lunar Passenger Sphere 1952, Fig 9 ECHO 1 Satellite, Fig 10 Aries IB,... | Download Scientific Diagram
Echo 1 Communications Satellite | National Air and Space Museum
