Spacewatch: Nasa's Echo 1 anniversary | Science | The Guardian
Satellite communication - Development of satellite communication | Britannica
Echo 1 Launched Communications Revolution - YouTube
Communications satellites
Launched in 1960, Echo 1 was designed to explore the new field of communications via space. Its design was remarkably simple: Essentially a large balloon, measuring 30 meters (100 feet) across, the
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Project Echo 1
Lunar Passenger Sphere 1952, Fig 9 ECHO 1 Satellite, Fig 10 Aries IB,... | Download Scientific Diagram
The "satelloons" of NASA: The first passive communication satellite experiments of the early 1960s
Project Echo - Wikipedia
Echo 1 Passive Communications Satellite by rlkitterman on DeviantArt
The Echo 1 Satellite by Bettmann
File:Echo 1 Communications Satellite (flight spare) - Udvar-Hazy Center.JPG - Wikimedia Commons
Image: First pass of Echo 1 satellite over the Goldstone Tracking Station
Project Echo | NASA
August 1960 - Project Echo Launched | NASA
PAGEOS - Wikipedia
Communications Satellite, Echo 1 | Launched in 1960, Echo 1 … | Flickr
NASA - NSSDCA - Spacecraft - Details
Project Echo - Wikipedia
Echo 1 Communications Satellite | National Air and Space Museum
Echo 1 satellite hi-res stock photography and images - Alamy
A Look Back at NASA's Historic Echo-1 Satellite Launch
Echo
Echo 1 Satellite during tests in 1960: 30.5 m in diameter, 0.5 mil Mylar. | Download Scientific Diagram
The Balloon Satellites of Project Echo | Amusing Planet
